Sonic The Hedgehog: Cybernetic Revolt/Story Mode

This page features the entire Story Mode of SONIC THE HEDGEHOG: Cybernetic Revolt. It is explained in every detail. As such, Spoilers are imminent. 
==Plot Synopsis Recap==
After his repeated defeats at the hand of his spiky blue nemesis, Dr. Eggman has put his genius to work to create a system of nanites under the name of "INVERSE" in order to robotize zones quicker and achieve his goal of world domination since they didn't require the usage of robotiziers. However, INVERSE rapidly grew in intelligence and betrayed the doctor and after doing so, covered multiple Mobian citizens in it's nanites turning them into half-organic/half-machine soldiers referred to by GUN as "Metallions". In order to combat the Metallion threat and defeat INVERSE, GUN sends Shadow and Rouge to recruit Sonic and Tails in order to combat this threat before it becomes too big for any of them to handle.
==Stories==
===Sonic's Story===
Cutscene -  Tropical Relaxation
After taking back the world from the evil Doctor Eggman, Tails suggests to Sonic that they relax at Eastside Island over at Leaf Forest Zone. Sonic states that he's still up for some more adventures and Tails reminds him how badly he was injured during his encounters with the mysterious Infinite and that he really needs to relax and not overexhert himself. Sonic finally agrees and the two head for the island on the tornado. Meanwhile in a dimly lit computer room, A familar evil scientist sits in a chair evily chuckling as he plots his newest scheme.
Leaf Forest Act 1 - Tropical Paradise
After landing, The duo relax on Leaf Forest for awhile with Sonic telling Tails that he's heading off to explore Leaf Forest once more with Tails telling Sonic to wait up and hold on giving chase. From here, The level is a identical 3D version of it's original GBA 2D counterpart. 
Cutscene - Metal Sonic RETURNS!
During their travels through the area, The duo is suddenly ambushed by Metal Sonic! Tails is shocked that Metal Sonic has returned so soon after his defeat last time with Sonic seeing it as a new challenge and telling his robotic doppelganger to bring it on. Metal Sonic then flys off with Sonic chasing after him wisecracking all the way. Tails once again tells Sonic to wait up and follows after the two. However things take a turn for the worse as mid-chase, The island begins to become bombarded by aerial strikes and Sonic is hit by one of the strikes and sent flying in the deeper areas of the forest with Tails yelling his name in horror before chasing after Metal Sonic.
Leaf Forest Act 2 - Burning Woods
This act is more based off of Green Forest as Sonic is forced to traverse through the burning forest and dodge incoming aerial strikes as unlike the previous act, This one has enemies. These mysterious mobian attackers will be using all sorts of Eggman weaponry to hinder Sonic throughout the act. Multiple bridges and platforms will burn down from the strikes as Sonic must keep on the move throughout.
Cutscene - A New Foe Appears!
Sonic finally catches up with Tails, who is standing over a sparking Metal Sonic, as he watches Metal Sonic escape. Tails is pleased to see that Sonic is okay with Sonic asking Tails what in the world is going on. Tails replies that a army is bombarding the island but that it isn't Eggman's and that Sonic must've encountered them in the deeper regions of the forest. Sonic replies yes to having encountering them and noticed they were mobian but weren't robotized. A unknown voice then is heard which refers to the two as "simple creatures" and tells them it's only natural they aren't robotized but they have been "evolved". Sonic then asks who is there with a mysterious formless monster coming over the hilltops and saying that it is. Sonic then cracks a smirk and accuses it of being "another monster of Eggman's". The entity then says that if Sonic really wants to call it that. He should fight it and find out himself. Sonic jumps at the chance to clobber it and the fight begins.
Boss Battle - Strange Creature
The creature's attacks are extremely hard to dodge as it utilizes it's arms as weaponry turning them into sharp blades,saws, and needles as well as being able to strech incredibly far and spin around as a wide area attack. Due to it's formless shape in this fight, You are unable to lock on and use a homing attack and the creature hits you back if you use a spindash. This fight is unwinable.
Cutscene - All Hail Shadow
After a grueling battle, Sonic is sent flying into a palmtree as the force of the impact causes it off to fall down and break off it's roots. Tails frantically hurries to help Sonic after that beating as the creature states that "The Blue Blur" was not as strong as he had expected it. He then questioned why Eggman had so much trouble beating Sonic. The creature's arms became guns and while Tails was distracted helping Sonic, It charged up to destroy them both. However in a shocking twist, all of a sudden Shadow and Rouge rush up as Shadow chaos spears the creature away! Tails is surprised of their arrival as he says Shadow's name in shock. Shadow then informs the two-tailed sidekick that there is no time for talking and tells him to get Sonic to safety by heading down to the shorelines as there's a GUN ship docked there while they take on the creature. Sonic is carried to safety as Shadow and Rouge take on the unknown creature. 
Cutscene - Wakeup Call
Sonic finally regains cousiousness with Tails relieved that he's finally awake. Sonic asks how long he's been out with Tails remarking it's been a couple of weeks and that things have gone downhill since then. The unknown army has been identified as The Metallion Federation and they have plans to "evolve" all of the citizens of Mobius. How they plan to do this is unknown but according to what they already know, The army's followers are rising quickly and at a alarming rate. Sonic then asks Tails why they haven't headed over and taken down the person responsible with Tails grimly telling Sonic that the leader of the army is that strange monster that put him in a coma for all this time. Sonic is surprised of this to see that creature is behind all of this. A seemingly only talkative and obedient creature that might've followed Eggman. Sonic then hops at the chance to settle the score with it after what happened at Leaf Forest with Tails reminding Sonic that he still needs to recover as his injuries haven't fully healed. Sonic attempts to get up from his bed only to fall right back down succumbing to the pain. Tails then tells Sonic that he should probably leave this to "us" with Sonic asking what he means by "us". Tails states that this place that they are both in is a GUN facility and that Shadow and Rouge both were under orders from GUN to assist them during the fight with the creature as apparently the army is recognized as a possible global threat. As such, Tails has been recruited to fight alongside the both of them and the rest of GUN. Sonic then remarks in a shock that it's too dangerous to go through with something like this on his own as he could possibly get killed with Tails reminding Sonic that he isn't some kid that needs babysitting before walking off. After Tails leaves, Sonic jolts up revealing he was faking it and that he states he is sorry for tricking Tails and that he simply can't sit this one out.
After this cutscene, Tails' Story is unlocked.
G.U.N. Fortress Act 1 - Training Facility
The biggest stronghold of humanity from Shadow The Hedgehog is the second stage of Sonic's story and as he traverses the long halls and multiple hangers with classic SA2 GUN Bots all around. The training facility is full of multiple holoscreens that give tutorials via the screen. This can be considered the "true" tutorial stage of the game.
Cutscenne - Warning
Sonic is running further and further through the halls as he's suddenly forced to stop as Shadow is standing ontop of one of the tanks in the hanger both of them are in. Shadow then casually states in his usual serious tone that Sonic should be resting. Sonic then tells Shadow he can't simply sit something this huge out. Shadow warns Sonic that if he proceeds any further he will be forced to stop him. Sonic replies by telling Shadow to bring it on and Shadow remarks that Sonic's "idiocy" knows no bounds as he chaos controls away. 
G.U.N. Fortress Act 2 - Final Test
Entire rooms and halls have been sealed off by GUN to prevent Sonic from proceeding as the stage works like a gauntlet to test how good you are at dealing with enemy hordes as Sonic battles his way through it while dealing with platforming.
Cutscene - Familiar Foe
Sonic continues rushing through the halls as he reaches a large wide arena with a big mech waiting for him as Shadow stands ontop of it. Sonic then looks up immediately recognizing it to be the same mech he took on back in City Escape. Shadow then tells Sonic he was warned as Shadow backflips off of the mech and prepares to fight Sonic only for the commander to call Shadow via communicator and tell him to pull back. Shadow then scoffs and tells Sonic that he's letting him off the hook this time as he teleports away. The pilot in the mech then says "This is Big Foot to Central Command. I'm engaging the hedgehog over!" as the battle begins.
Boss Battle - F-6t Big Foot (Test Mod.)
Here we have the return of Big Foot from SA2 with the exact same fight as last time with the added test modification of a spherical barrier to block homing attacks and spindashes. Usage of the arena is nessecary to bring it down as Sonic must lure it towards a unstable panel in the flooring in order to shock it and disable the barrier. The pilot yells "Central Command! Critical damage taken! I repeat Critica-...Aaaaauuuggghh!!" as the machine explodes.
Cutscene - The Commander
After defeating Big Foot, Sonic is confronted by Commander Abraham Tower of the Guardian Units of Nations. The commander yells at Sonic for his brash behavior destroying GUN weaponry and not heeding Shadow's warning to rest as Sonic is one of the army's most valuable assets being such a powerful fighter. Sonic then reminds the commander he's not a soldier and that he can't simply sit something this huge out for that long. He remarks that if something isn't done quickly. The results of this could be catastrophic. The commander then calms down and admits that Sonic is right. After a quick time skip, The commander gathers Sonic,Tails,Shadow,Rouge, and Omega together to inform of the plan. Before the plan can be told however, The cutscene fades to black and ends.
Aquatic Relix Act 1 - Aqua Caverns
All of a sudden without a cutscene pre-zone. The player is thrust into a returning zone from Sonic Pocket Adventure. Aquatic Relix is a redone Aquatic Ruin (in this canon, replacing Aquatic Ruin) and the third zone of the game. Aquatic Relix is styled in the same layout of Aquatic Ruin however given the 3D touch with alot more focus on water as well as exploration in the deeper parts of the area. Enemies in this zone are robotic echidnas known as "Brass Knuckles". Ancient machines made by the Echidnas to guard areas. 
Cutscene - The Plan
As Sonic continues further through the ruins, He discovers a entryway underwater much to his dismay due to his fear of water. He sighs as he remembers he has to fullfill his end of the plan. This causes a flashback to The Commander explaining what the plan is. Each of the team have a special assignment in this plan. Sonic's role in the plan is to head to the ancient ruins and recruit his ally, Knuckles, to aid in the war after Knuckles went missing. Sonic agrees to it and asks if his best friend,Tails, is coming with him only for The Commander to reply with a no as Tails has a different assignment waiting for him in the plan with Tails telling Sonic that he'll be fine. Sonic begrudgingly agreeing. The flashback ends as it's back to present day with Sonic headed down underwater.
After this cutscene, Shadow's Story is unlocked.
After this cutscene, Rouge's Story is unlocked.
Aquatic Relix Act 2 - Lakebed Entryway
This area is more based around the dreaded Labyrinth Zone as it's a big cave system and it's very flooded with water. Difference being it's more trap-happy as multiple defense systems including crusher walls,spikes, and water overflows designed to eliminate intruders. Brass Knuckles are also present in this act swimming around doing spinning dive attacks toward Sonic whenever he's in their field of view. At points, Sonic will be forced to speed up and make his way through multiple wall and spike blockades before the wall overflows the area and he drowns. 
Cutscene - Guardian of the Caverns
Sonic takes a breather for a moment knowing he's finally gotten through the last of the traps only for the floor to shake as he's confronted by a stone golem. Sonic then says that if it's looking for a fight. He will be more than happy to give it one.
Boss Battle - Forgotten Golem
The second new boss for the game. The golem's body can be homing attacked but it doesn't effect it. The golem is a wide range boss as it's stomps generate small range shockwaves while it's jumps generate wide-range shockwaves and it's arm swings cause the stones that make  up it's arms to fall off the torso and begin rolling around before sticking back. It also has a charging attack that it homes in on Sonic with. Unless you use a homing attack, You cannot avoid this attack as it homes in on Sonic. Homing attacking it mid-charge will cause it's head to fling off as the body collapses. It will soon recombine itself and reveal a glowing core within the rocks that make up it's torso. Attacking the core will damage it.
Cutscene - Resigination
The golem makes a loud grunt as it recombnes and gets up from the fight with Sonic asking cockily if it wants to "play" some more. The golem's body begins cracking as it slowly stomps over to attack Sonic and when it finally the hedgehog. The cracks are at their peak and the golem shatters into multiple tiny pebbles. Sonic continues advancing through the caverns as he stumbles upon more mossy and broken parts of the caverns.
Ancient Caverns Act 1 - Mossy Halls
This area utilizes the quick step mechanic and quick-time events as Sonic must traverse the mossy hallways of these ancient caverns. The floors will be falling apart and spikes will be a-plenty. There will also be sections where Sonic will have to swing from chains and outrun the falling bricks. Brass Knuckles are still present in this stage's act but a more broken down variant of the Brass Knuckles that cannot attack and simply spark and move towards Sonic. Their sparking can damage him.  
Cutscene - End of the Caverns
Sonic soon makes it to the end of the caverns as he stumbles upon a glorious palace resembling Hidden Palace as a quick flashback image of Sonic Pocket Adventure is seen on-screen. After that, Sonic begins walking and looking around for Knuckles. 
Ancient Caverns Act 2 - Aquatic Palace
This act is more of a cinematic act and is very short. Sonic is unable to run,homing attack, or spindash. He can only jump and walk. There's no enemies or anything that could harm Sonic.
Cutscene - Tougher Than Leather
Sonic confronts Knuckles at the shrine area of the palace as Sonic beckons Knuckles by calling his name. Knuckles turns over enraged to see Sonic and he runs over to punch him with Sonic flipping over and asking what the deal is. Knuckles then shouts that Sonic knows exactly what the deal is and that "it's time to make him pay". 
Boss Battle - Knuckles the Echidna
Just like in games prior, Sonic and Knuckles once again have to duke it out. Knuckles is a much more challenging adversary this time around as he glides around and slams down with a divebomb fist attack after sticking to walls. He can also dig underground and come up with a uppercut. He'll actively attempt to dodge out of the way of your attacks by sidestepping and jumping back for spindashes. He'll also block homing attacks. Knuckles will only drop his guard down in the middle of a uppercut so that is the best time to go in for a strike. Halfway through, Knuckles will feign defeat only to get back and regain half of his health as he does his classic laugh taunt from the Classic games.
After this boss battle, Knuckles' Story is unlocked.
Cutscene - Apologies and Explainations
After a grueling fight, Knuckles gets back up to his feet and continues his assault on Sonic with Sonic calling him a hardhead and telling Knuckles to cool off and tell him what's going on as Knuckles' fist slams into the wall. Knuckles begins shouting as he shouts he calls Sonic a blue rat and tells him that he broke the Master Emerald in Hidden Palace as a flashback of a shadowy figure that looks exactly like Sonic beats Knuckles to a pulp and then homing attacks the Master Emerald as a flash occurs. When Knuckles came to, The figure was gone and strange people were beginning to enter the palace. Sonic explains those strange people were the Metallions and one of their ranks probably impersonated him. Knuckles asks what Metallions are with Sonic replying that he's not sure himself. All he does know is that they are Mobians working for a creature that He and Tails encountered back in Leaf Forest. He then tells Knuckles that He and Tails were recruited by GUN agents, Shadow and Rouge, for this mission to stop the Metallion Federation as they recognized as a global threat and that Sonic's been enlisted to recruit Knuckles. Knuckles agrees to this as he's looking to recover the pieces of the emerald and get even with the person who shattered them. Knuckles directs Sonic to a hidden passageway and they head down into a cave system.
Mystic Cave Act 1 - Mystical Cavern
Another returning zone. This one is Mystic Cave. The level design is based off of Lava Mountain Act 3 as a climb straight up through the caves while dodging several traps and outrunning Metallion excavators along the way. Knuckles will also assist in this act to help Sonic up to higher areas of the level. 
Cutscene - Breaking Point
Sonic and Knuckles continue running as rocks begin to collapse on a pursuing Metallion excavator. Sonic remarks that they just keep on coming. Knuckles mentions Oil Ocean is ahead and they could hide over there with Sonic telling him that Oil Ocean's been reactivated and taken over by Metallion forces. Knuckles then gains a idea as he begins rapidly punchiing the wall with Sonic asking what's he doing. Knuckles shouts that if the cave collapses, Metallion forces can't pursue them and that he's found a alternative way out of the caves and that Sonic should go ahead as he'll catch up. The caves begin shaking and collapsing as Sonic and Knuckles both split up and make a break for it.
Mystic Cave Act 2 - Crumbling Caves
This level is a 3D cinematic level similar to the final act of Terminal Velocity. It's a straight run through a "hallway" as you quick-step and dodge oncoming rocks and falling platforms as well as stay on the right path.
Cutscene - Freedom
Sonic zooms out of the caves ending up in a jungle as he slows down with Knuckles gliding out of another hole right behind him as the cave collapses. Knuckles states that was a close one with Sonic cockily stating that was no problem at all. Sonic then asks where they are as he doesn't recognize this zone with Knuckles replying that they should explore and find out. 
Azure Jungle Act 1 - Return to Dawn
This zone is a deep jungle area and based more on Jungle Joyride / Adabat Day from Unleashed. There are multiple Metallion Prowlers as enemies in this act. The prowlers are Mobian monkeys that climb around as well as swing on vines and throw bombs. Near the end of the stage, Multiple Metallion Prowlers will pursue Sonic by swinging on vines and Sonic must quick-step dodge all of their bombs. Once the chase is over, They will lose vines to swing on and fall off the stage. 
Cutscene - Surprise Resistance
Sonic and Knuckles both stop running for abit as Knuckles is surprised that there are enemy forces in this unexplored area with Sonic stating that it's possible they found this area before them in the caves eariler. Multiple Metallion Prowlers then leap out making monkey sounds as hop around and attack the duo. The duo easily repels them with Sonic taking a moment to look at a uncousious one. Noting that it has cybernetics on it's body but not on the scale of a Robian. Not even close to being considering robotization. Sonic finds it strange and so does Knuckles but they press on.
Azure Jungle Act 2 - Bramble Blast
This act is in the more lethal areas of the jungle as multiple brambles are around that block Sonic's path as well as some that sprout upwards as Sonic's running to attack him. Sometimes the brambles might even knock away enemies when they sprout. The prowlers will also sometimes hang on brambles in the background to jump into the foreground and ambush Sonic.
Cutscene - King of the (Off-)Road
The duo continue running down the path of the jungle before discovering a cliffside road. They begin running on it only to then be intercepted by a Metallion vehicle. Both roll out of the way of the vehicle and it stops and begins backing up. Multiple Mobian prowlers hop onto the back of the offroader with their leader speaking from the driver's seat in a playful tone saying he can't wait to make pancakes out of the duo as the offroader revs up and turns around headed for the two as they start running!
Boss Battle - Metallion Offroader
This fight is a straight-up chase all the way through. In the beginning part as you dodge incoming bombs from the prowlers on the truck after surviving long enough, Knuckles will hit back one of the bombs and cause the truck to spin out. It'll then turn around and begin driving away with you having to give chase. Throughout the whole fight, The driver will be making multiple taunting phrases such as: "I've always wanted roadkill! Hee hee!", "Who's faster now, hedgehog?! Hee!", and "Hee hee hee! I'm the king of the roads here!". While your chasing the offroader, The prowlers on it will now be able to be homing-attacked and stun as a result. But you'll need to quick step to dodge incoming bombs from them. The truck can only be damaged by waiting until one of the Prowlers are holding a red bomb and then homing attack that prowler to make it drop the bomb and damage the offroader. The offroader's design is based of a Tacoma. However heavily modified for battle purposes.
Cutscene - Dethroned
As the offroader's moving across the roads, It begins smoking and exploding as the Metallion Prowlers jump out with the driver rolls out. The offroader slams off the cliff and it explodes into pieces. The two then confront the leader of the Prowlers as the cybernetics on his body begin sparking and melting off of him much to the shock of the both of them. The rest of the prowlers have the same happen to them as the leader shakes his head in confusion wondering where he is as he realizes this isn't Mobotropolis. Sonic then informs him that he was under mind control with the leader and his comrades angered they were used against their own kingdom. Sonic offers to take them to a GUN facility where they will be safe and they agree. 
Cutscene - The Ace in the Hole
Time skips ahead as everyone gathers for a meeting once more with the addition of Knuckles and Dr. Eggman being present. Sonic's intially surprised to see his arch-enemy present with him asking "what's egg-head doing here"? The commander replies with saying that Doctor Eggman's Eggman Empire has incredible military strength and that he sent Tails to recruit him. Eggman states in a insulted tone that he's not some soldier that GUN can order around with The commander stating he's well aware of that. The commander then goes over the plan currently. He states as it stands. The Metallion Federation's lost alot of it's weaponry and confidental information as well as some of it's influence. Now it's time to launch a full scale attack on the Metallion forces and send them packing as thanks to Tails,Rouge, and Shadow's efforts in cyberspace, They have located the Metallion barracks where they plan to launch their sky fleet. With this information, They can head over and stop the sky fleet before it can take off. The commander begins stating who will do what with him stating that Sonic will be responsible for cutting off their backup support by taking out two other strongholds. One in Genocide City and another in Oil Ocean. After that, The cutscene ends before The commander can say what the others' roles are.
Genocide City Act 1 - Ruined Metropolis
A unused level from Sonic 2 makes it's debut here. Genocide City Act 1 takes place on the rooftops of the city as Sonic must traverse through and dodge Helicopters and Defense turrets as well as grinding on rails on the side of buildings. There are also mines on the rooftops as well. Genocide City is the halfway point of the story. This is where things get crazy.
Genocide City Act 2 - Cybernetic Stronghold (Main)
Surprisingly this act has no cutscene before it. It picks up right where the last act ended grinding towards the Metallion stronghold. You grind fastly into the Metallion stronghold and slam through the window as the alerts go off as your forced to homing attack through security doors and make your way up the halls while outrunning closing doors that could crush you. Multiple Metallion ground soldiers (which vary in mobian species from fox,dingo, and monkey to panda,rabbit, and wolf.) carrying blasters will be in your way as some will even be manning stolen GUN mechs to take you down. The level is split up into three levels. Lv. 4,Lv. 5, and Lv. 6. You automatically start on Lv. 5 and have to fight your way through all three floors before you beat the level. The level also has electrified floors and floating platform segments along with homing attack platforming using enemies. 
Genocide City Act 2 - Cybernetic Stronghold (End)
Yes. The level does not end after you get to the goal ring. Sonic destroys the core of the stronghold with a homing attack in a mid-gameplay cutscene and the final stretch becomes a frantic run all the way down to the bottom of stronghold as the whole place begins falling apart making you retread previous platforming challenges with some of them even destroyed by this. However, you're unable to reach the bottom floor as security doors close in on you. So to finish the level. You have to spindash out the window towards ground-level to reach the true goal ring. The level finally ends after that. 
Cutscene - Genocide City's Elite
Sonic begins running through the streets as the stronghold goes up in flames as the soldiers' cybernetics melt down as they freed from what seems like mind control. After Sonic is safe distance away in the streets. He watches the fireworks only for something to climb up from a nearby manhole and slowly get up. Sonic remarks that it looks like someone's ready to rumble and he says bring it on.
Boss Battle - Metallion Elite
The Metallion Federation's elite. This mobian bear clad in armor is the elite of the army as he is able to do multiple punching combos and even do a dash punch. He can block homing attacks and spindashes as well as grab Sonic and slam him down on the ground. He can let loose a roar that causes debris to fall down. He's vunerable while he's roaring so that's the best time to go in for a hit. When he has only one hit point left, He'll go into a beserker rage and run all around the arena as well as towards Sonic. The only way to finish him off is to lure him into a wall and wail on him by homing attacking him several times until that final hitpoint is gone. 
Cutscene -  The End of the Stronghold
The Metallion Elite holds his head after the thrashing he got from Sonic and begins frantically running cartoonishly back into the manhole. Sonic remarks that was certainly a challenge and that he doubts he won't see the elite again and looks foward to "Round 2". Sonic then begins casually whistling "The World Adventure" theme from Sonic Unleashed as he walks off.
Cutscene - Destination Arrival
Sonic sits in a GUN chopper as he awaits the chopper's arrival to his destination impatiently. Time skips ahead to where the chopper is directly above the refinery. Sonic begins opening the door with the pilot asking what he's doing as they haven't landed with Sonic stating "he's outta here" as he flips off the helicopter and begins falling towards the refinery.
Neo Oil Ocean Act 1 - Metallion Refinery (Start)
The level opens with you falling inside the industrial chimney of the refinery as your forced to dodge catwalks on the way down. Before you can reach the bottom, A blast of smoke makes Sonic zoom all the way up into the air as you're given a short ammount of time to homing attack the roof in order to cut your way through to properly get into the main part of the level.
Neo Oil Ocean Act 1 - Metallion Refinery (Main)
The refinery is packed with Metallion workers that throw wrenches and hammers at Sonic. They cannot be defeated as they attack from the background on ladders and catwalks. The refinery is also very platforming heavy as large ammounts of it are covered in oil which acts just like it does in the original incarnation of Oil Ocean. Some areas of the refinery are even blocked off due to oil overflow and require Sonic to get rid of the oil to open the door and proceed. There will also be times where Sonic will have to speed up and quick step to outrun a overflow of oil. 
Cutscene - Just the Beginning
Sonic celebrates victoriously as he deactivates the power supply to the refinery with the intercom. activating as a familar foe speaks on intercom. informing Sonic that he's celebrating too soon. Sonic recognizes the voice as "that thing" he fought back in Leaf Forest a few weeks back. Sonic states smugly that he was waiting to finally settle the score with "the head honcho himself" with the voice over the intercom. stating he is all too eager to fight Sonic again but this is not the place. He then goes on to say that he'll fight Sonic again soon and show him the way of "Evolution" with Sonic accepting the challenge. Sonic runs out of the refinery only to see up ahead is a Oil Plant bigger than the refinery as Sonic makes a cartoonish shocked expression as he hurrys over to shut it doown.
Neo Oil Ocean Act 2 - Oil Plant (Start)
The beginning of the level begins outside of the oil plant as Sonic slowly makes his way up via speeding up and quick-stepping to dodge security systems which are mainly turrets and mines. There's also a mini-boss in the form of a mobile turret that follows Sonic that must have it's missile hit back in order to destroy it. Once defeated, Sonic will have made it to the plant as he blasts through the fence.
Neo Oil Ocean Act 2 - Oil Plant (Main)
This level is also a gauntlet however this one is more platforming-based. You are forced to traverse multiple conveyer belt,enemy, and oil platforming challenges to reach switches that open Lv. 1,2,3,4, and 5 security doors. As you proceed however, Security will get tighter and you'll have fewer doors to get through. This part of the act is actually on a time limit as you have four minutes before security becomes too tight to get through. Once you get pass the Lv. 5 security doors. You'll reach a computer room with a big switch that has pressed. The switch will increase the power on the cooling tower. It must be then pressed three more times for the power to reach critical percentage. The cooling towers' power will then be seen overloading causing the towers to explode and collapse in a cutscene.
Neo Oil Ocean Act 2 - Oil Plant (End)
Now the time limit has been reset to 1 minute as you are forced to run down a hallway and homing attack through security doors in order to get down to the bottom floor before the fire spreads to the oil and the whole facility goes up in flames. 
Cutscene - Frantic Takeoff
Sonic quickly runs out of the plant as it goes up in flames. He breathes heavily from that experience as he couldn't have cut that one closer. He then looks up into the sky to see a massive sky fleet with The tornado giving chase to it. Sonic notices while Tails is driving the plane, both Shadow and Rouge are on it as passengers. Sonic then remarks that it looks like the final stage of the plan's beginning and that he doesn't want to miss the party. Sonic begins backing up as he starts running quickly at max speed as he hits a spring. Zooming into the air after the fleet, He BARELY misses the bottom of a airship and he begins falling but Tails manages to catch him in the tornado and Sonic thanks Tails with Tails telling Sonic not to thank him yet...They still have to stop the sky fleet.
Sky Babel Act 1 - Metallion Fleet
This first act is a straight-up Sky Chase level as you control Tails surprisingly for this single act in Sonic's Story. The entire level is 3D as you shoot down enemy fighters and dodge lasers from the fleet. This act has a mini-boss in the form of the ship engines. Before you can board the central battleship. You'll have to take out the engines of the other ships to keep them from shooting you down. The engines must be shot directly and you must dodge and shoot multiple Metallion sentry bots that fly out of the ships to attack. The act ends once you reach the central battleship.
Sky Babel Act 2 - Central Battleship
This is it. The central battleship. Your getting closer and closer to the one behind it all. This act is pretty tough which is to be expected from the third-to-last level of the story. This area's got Metallion Elites crawling all over it. These elites are weaker than the boss version but still tough. There are also sentries around the serious platforming segments. There will, of course, be platforming challenges along the way such as wall-jumping across a large gap so you don't fall off the ship to your death. Grind-railing outside around the ship. Enemy platforming as well as a switch puzzle at the end of the act. This act does not have a goal ring. It requires you to reach the mystery creature to finish it similarly to how Final Haunt ends when you reach Black Doom.
Cutscene - My Name is...
Sonic finally confronts the mystery creature at the command center as he's surprised to see....It's turned one of it's arms into a blade and....It has Amy hostage! Sonic, in a enraged tone, shouts to let Amy go with it responding that it would be inadvisable to make threats towards the one holding a hostage. The creature then responds that introductions are in order. It introduces itself to Sonic as INVERSE, The mastermind of the Metallion Federation, and states he's been waiting a long time to finally meet Sonic again face to face. He then goes on to say that Sonic will be able to witness Amy undergo "Evolution" and become a part of his perfected mobian and human race. The "Metallion" race. Sonic attempts to run to rescue Amy but he is too late. She is stabbed by INVERSE and after that, The formless leader begins slithering off through a door. Sonic runs over to Amy to check to see if she is okay and only to see she's completely fine..except for one thing...There's grey goop on her and the goop begins directly covering her with Sonic stepping back. The goop completely covers Amy as she gets up. The goop then dissipates revealing a Amy with neon crimson eyes, A steel version of her normal modern attire, and two piko-piko hammers she wields with ease.
Boss Battle - Crimson Rose
The battle against Crimson Rose begins. She has the highest health bar out of all of the bosses before her and she doesn't mess around. Crimson Rose has her "Pink Cyclone" which involves her spinning around with her hammers into a tornado that shoots off multiple other smaller tornados. The "Redhot Rush" is another one of her techinques as she rushes Sonic and flips into the air. Slamming down with her hammers. The impact generates multiple lethal shockwaves. Another techinque of her is the "Rose of Death" which involves her dropping her hammers and using a spindash to bounce all around the room. Crimson Rose is indeed a worthy third-to-last boss. 
Cutscene - The Sky Babel's Destruction
Sonic sweats heavily as he comments that hammer of her's packs a punch. He's surprised at how strong Amy's gotten. The sounds of a alarm goes off as the ship shakes and begins tilting. Sonic realizes it's time to go as he grabs Amy and begins running up the stairs and down the hall. Meanwhile outside, The entire fleet is going down out of the skies as it's being blown to bits by GUN fleetships with a soldier reporting to the Commander that the Sky Fleet is exiting air space and are in a crash course for a unmarked area. The commander victoriously yells "Yes!" and slams his desk that the tables have been turned. Meanwhile inside the central battleship, Sonic hurries to the hanger towards the tornado as the whole ship's collapsing around them. The tornado's preparing to take off and Sonic hands Amy to Tails and tells him to take care of her while she recovers with Tails telling Sonic that makes three people under his care with Sonic confused. Tails shows a uncousious Cream and a uncousious Big. Sonic then realizes all three of them must've been infected by INVERSE's "evolution" with Tails asking who INVERSE is. Sonic responds by saying it's the name of the creep behind all of this as he begins hopping on the tornado. It takes off as the sky fleet crashes into the ground and explodes. The tornado heads down to see where the fleet crashed only for Tails to realize in shock where they are and at that moment...A hand bursts out of the rubble as INVERSE and all of his Metallion soldiers climb out of the rubble and advance into....ROBOTROPOLIS?! Both GUN and the Team on the Tornado are surprised that all this time, The main fortress of the Metallion Federation was Robotropolis and for a moment, They suspect Eggman really did have a hand in all of this...that is before Eggman hovers in on his eggmobile and opens fire on the Metallion forces. The group hops off of the tornado as Sonic utters the words: "Here we........GO!" as the cutscene ends.
Robotropolis Act 1 - Robotic Streets
This is it. The final stronghold of the Metallion Federation. Push! INVERSE is within your grasp now! Act 1 is a exploration level as you are forced to traverse through alleyways and streets in the city in order to reach the Robotropolis Fortress. The enemies here use combat mechs and turrets as well as the hardest variant of the regular Metallion Soldier. Which is the "Metallion Commando". The commandos are the only variant of Metallion to be human. They carry rlifes to shoot Sonic with along with rolling grenades and a rocket launcher. This is the first act of the penultimate level. Expect the second-most difficult here.
Robotropolis Act 2 - Final Attack
After the exploration act previously, This one is a gauntlet in the first half and the second half is well...we'll get to that in a second. The gauntlet is a boss rush where you fight replicants of all of the previous bosses in Sonic's story. All of them have the same strategy as the first time they were fought except Replicant Knuckles. Replicant Knuckles now no longer blocks but can do multiple uppercuts at once at a very fast rate. Once the last replicant which is Replicant Amy, which is surprisingly modeled after Normal Amy and not Crimson Rose, is destroyed. You move onto the second half. 
Boss Battle - Metallion Exterminator
There's not even a "third" act for the boss this time. You fight him at the end of Act 2. The exterminator is seen deactivated when you reach the goal ring in Act 2, The commandos reactivate it and it smacks the goal ring. This shatters it and starts up the fight. The machine is a rebuilt downscaled version of The Eggsterminator from Sonic X and is a interesting fight. His fight is the only one that's essentially a level as the Exterminator attacks from the background with missiles and lasers. The only way to damage him is to get to the end of a section of the area and fire a cannon to damage it. It must be hit three more times to finish it. 
Cutscene - Exterminated
The Exterminator falls to the ground and smokes from it's defeat as Sonic hops over the body and continues proceeding. He briefly comments on the battle he just had saying he's surprised the Metallion forces managed to get their  hands on one of Eggman's more dangerous "toys". He then bolts down the streets towards the fortress as Shadow catches up right behind him with Rouge running on the rooftops and Tails flying right infront of her. Knuckles is running as well but he tells Sonic that he's leaving the rest to them as he's still got to find the last few shards. The others are fine with it and Knuckles heads off as the rest head inside.
Final Stage: Heated Headquarters Act 1 - Last Corridors
This is it. INVERSE's Headquarters. You've won the war. Beaten his forces down and made them run all the way to here. All that's left is to take down INVERSE and END this. This act is home to multiple 2D sections as you climb all the way to the top and fight your way through gauntlets of enemies. The 3D sections involve outrunning gears and missiles as well as even going outside for one part to climb up that way before going back inside. The last stretch involves a chase with Metal Sonic, who finally returns into the story, as he fires upon Sonic. This chase is in 3D and requires Sonic to quickstep to dodge. The chase and act ends once you reach the goal ring.
Final Stage: Heated Headquarters Act 2 - Evil Foundry
The dark halls of the Evil Foundry. You've made it. This is INVERSE's lair. This is the final level of the story and the hardest as it combines bits and pieces of all of the previous platforming challenges encountered in the game. There are multiple Eggman statues in the level that show Eggman in his classic look with his Sonic jam artwork pose. They guard the way to secret rooms. The secret rooms do nothing aside from granting you loads of rings as a prize for finding them. The stage also pulls a bait and switch. If you don't jump at the end when you reach the goal ring, You fall through a trap door and land in a trap room with multiple eggman monitors that never appear in any other part of the game. You'll have to retread the last part of the level after exiting the room to finish the level.
Cutscene - Brothers Reunited
Sonic stops running as he's infront of a giant gate. Tails and the others run up with Sonic wondering just how they are  gonna get that gate open. But before they can move to do anything to it. They are ambushed by Metal Sonic as he points toward Sonic and proclaims that he's been waiting a long time to settle the score with Sonic responding that he is surprised to see Metal capable of speech again. He tells the others to go on ahead while he deals with Metal and they all do except Tails who insists on fighting with Sonic. Sonic allows it and they fist-bump and they prepare to settle the score with Metal once and for all.
Semi-Final Boss Battle - Metal Sonic
Payback's a cruel mistress. But here we are. The long-awaited showdown with Metal Sonic. As the second-in-command of the Metallion forces, This metallic doppelganger doesn't mess around. He has his purple shield around him to prevent damage and can unleash his maximum overdrive which is a barrage of several electricity walls as well as spark spread-shot projectiles. He can also glide down for a quick shot at Sonic. The only way to beat Metal is to keep him within Tails' line of fire long enough for him to chuck a dummy ring bomb at him to shatter the shield and make him vunerable. Metal usually says a specfic quote to clue the player in on which attack he'll be using before he uses it. Halfway through, He'll begin and he'll lose his shield. During this, He'll grab Tails and repeatedly throw Tails, who will be in spindash form, at Sonic. After that, He gains new tactics. Such as faking out the player into thinking he's going to attack and a homing attack that doesn't home in and only targets Sonic's position. He'll be sparking repeatedly during Phase 2, The only way to damage him is to wait until Tails is no longer in Metal's grasp and use a homing attack on Tails to have him grab and fly up to swing and use Thunder Shoot from Heroes to sling you at Metal and damage him. 
Cutscene - The Final Battle Begins!
Metal Sonic floats upward as he holds a Master Emerald shard much to the surprise of the two. He flys towards Sonic with Tails getting in the way as both Metal and Tails tumble out the window as Sonic yells Tails' name in horror. However before he can go after them, Shadow's voice is heard calling Sonic's name and saying he and Rouge need Sonic's assistance so Sonic rushes through the open gate. Where he sees Shadow and Rouge fighting INVERSE. Sonic rushes into the fight and attempts to homing attack INVERSE only for him to slither out of the way. INVERSE then states he's been looking foward to this and now finally he will show the world's savior his ideals and how powerful "Evolution" can really be.
FINAL BOSS BATTLE - INVERSE
"A wise person would be going after his friend to save him or staying away out of harm's way. Yet here you are. Still fighting me. Very well, Hedgehog. Evolve or DIE. That is my only offer left for you."
Phase 1 - Null
The moment you've all been waiting for. The final battle against INVERSE. He has only one hitpoint but it's difficult to actually hit him. The fight is split up into multiple forms. In his formless state (first form), He will slither around and attempt to catch you offguard. He will usually go to slice you while he's slithering around. You must wait until Shadow's fully charged up and then lure INVERSE to Shadow in order to use Chaos Blast and end the first form of the fight. 
Phase 2 - Birth
After the chaos blast hits him, INVERSE's body splatters all over the wall and from the holes in the floor...."grey goop" slithers out and forms another INVERSE as INVERSE says "Evolution cannot be stopped. Only haulted. You simple creatures would never understand.". His body take on a more beastily form as a giant liquid mass. The floor will electrify as gravity is flipped and your on the ceiling. The liquid mass will move across the floor and send tentacles up to the ceiling at Sonic that generate lethal sparks. The tentacles must hit with a spindash and/or homing attack to get them off. Once all the tentacles are dealt with, Gravity will be restored and Sonic will land on a pillar as Rouge flys in the air and tells Sonic that if he gives her enough time, She should be able to reach the wall panel and overload the floor electricity to fry INVERSE. This part is a waiting game as you dodge INVERSE's fast charging by moving from platform to platform. Sometimes when he rams into a platform...His body will stick and spawn enemies to beat before sticking off and continuing the assault. Once the time limit is up. The electrified floor will be overloaded and INVERSE will be fried. Allowing Sonic to destroy him with a homing attack. A act which causes INVERSE's body to splatter all over the walls before dissipating like last time. This defeats the second form.
Phase 3 - Growth
More grey goop comes out. This time from the vents as a incomplete humanoid body with only the torso,arms, and head finishes is the form INVERSE takes this time as he says "You will never win. Give up and stop trying to delay the inevitable.". The third and penultimate form of INVERSE has him gaining loads of new abilties. He transforms one of his arms into guns and unleashes multiple big plasma shots that leave explosions upon impact. He also turns the other into a long-range whip. When the whip hits the ground, It will spawn multiple brambles that will rise up and must be avoided. The whip can also grip Sonic and squeeze rings out of him. So it is important to avoid it. Only blue plasma shots from INVERSE can be hit back to stun him and leave him open for a dropkick from Rouge. The dropkick will allow you to homing attack him into Shadow so he can use Chaos spear. Repeat the process four more times to defeat this form. 
Phase 4 - Perfection
As usual, Goop is splattered. It dissipates and more appears. This one comes from the gate and it forms a complete humanoid body as INVERSE says in anger "ENOUGH IS ENOUGH! Don't you know when your beaten?! I will show the perfection that your simple species rejects! BEHOLD EVOLUTION!". INVERSE's final form. This is truely it. You've got him down to his last leg and now he's going all out. INVERSE uses all of his attacks from the previous phases including some new ones such as extending his arms out for a wide-range spinning attack and getting up close and personal with Sonic to do multiple punches and kicks which can be countered via quick time event. He'll have a combination of his spin attack and his whip attack where he'll grab Shadow and Rouge, making them go into spindash form, and then spin around with them both in a Spindash Whirlwind. He actively dodge strikes like he did in the first encounter back in Leaf Forest as well as block attacks. This is the toughest fight in the story. His true health bar is revealed to only have one hit point but you can't seem to inflict fatal damage. This battle has been teamwork so far and it still is. Between certain attacks, Shadow will chaos spear INVERSE to stun him allowing you to homing attack him so that Rouge can rapid-kick him face-first onto the floor. This allows you to whale on him. He still won't go down though. He's the most durable boss so far and it will take loads of hits before he finally reaches the last part of this final fight. When the last part is reached, INVERSE will jump back and immediately speed up transforming into a whirlwind of "grey goop" at Sonic. Shadow will use chaos spears to hold it back long enough for Sonic to rev up a spindash and spindash into it. Which causes INVERSE to slam into the wall for the final homing attack to end it. 
Cutscene - Final Chapter?
INVERSE sparks as he asks how he was beaten. He was a perfect being. A being who had undergone "Evolution". A being who should be flawless. He was to be the world's "savior". To show them that "Evolution" was the way to survive. Sonic says that what he was doing wasn't evolution. It was terrorism. Being questioned like this, INVERSE grew angered and said "How dare you..?!....You..!...Little blue.. ". In a sudden lash, He STABS Sonic as he starts melting into a puddle....Sonic's surprised of being stabbed suddenly as he steps back with Shadow and Rouge running to him to see if he's okay. Sonic tells them that he's fine and just had a bad reaction for a second and that the war's over now. INVERSE has been vaniquished and there's nothing left to do here now. They begin walking out the room as Sonic cracks a smirk. The cutscene fades out to black and leaving only Sonic's eyes visible as they glow neon blue with INVERSE's laughing heard.
After this cutscene, Dr Eggman's Story is unlocked.
T H E  E N D ?
===Tails' Story===
===Knuckles' Story===
===Shadow's Story===
===Rouge's Story===
===Eggman's Story===
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