Sonic Adventure 4: Black Arms Rising/Story (Ch. 1-5)

This page features the first five chapters of the story mode for Sonic Adventure 4: Black Arms Rising.
For ch. 6-10, click here
For the last chapter, click here
== Chapter 1: Invasion of the Black Arms ==
Central City is under attack by a mysterious alien race known as The Black Arms. Now Sonic jumps into the scene to fight off against their forces.
The story begins one night in Central City's park where the citizens are attending an event called the Festival of the Black Comet, a comet in space that passes by earth every 50 years. They see the comet on the sky, which shows a red glow. Just then, dark red clouds appear, and the citizens are confused as to what is happening. They soon learn that a group of strange airships are approaching to Central City. As the fleet covers the city, an army of aliens appear from the fleet. The citizens make a run for their lives as they walk towards them. Some police guards evacuate them and the others begin shooting at the creatures, but to no avail. The aliens attack the guards and start damaging everything in the city, from buildings, cars, and highway bridges. G.U.N. troops arrive in their aircrafts where an army of soldiers set to fight against the aliens. Watching the havoc from a distance is none other than Sonic, who runs down to find out what's going on.
Stage 	Westopolis
Mission 	Eliminate 50 Black Arms
Character	Sonic
Allies 	G.U.N.
Enemies 	Black Arms
Somewhere at G.U.N. headquarters, a grey-haired commander by the name of Commander Abraham Tower is watching the attack of Central City at the hands of the invading aliens on a monitor. A GUN soldier arrives and informs him of the damage sustained in the six districts in Central City, with Westopolis receiving the heaviest damage. Some citizens were successfully evacuated to safety, but some of them fell victim to their attacks. The soldier also tells him of Sonic helping the soldiers to eliminate the Black Arms. Commander Tower isn't impressed with Sonic's heroism, but sees could use his help to battle against the Black Arms. So he orders the soldier to send in more troops to fight off some Black Arms across the region and also orders him to send a beetle drone to bring Sonic to the headquarters. As the GUN soldier carries on the orders, the Commander looks on, expressing his disgust towards mobians.
Back at Central City, the injured G.U.N. soldiers thank Sonic for assisting them in eliminating the aliens. Just then, Tails arrives to see Sonic. Sonic tells his long-time friend that he help the troops to eliminate a group of Black Arms. Tails informs him that he's seen their airship departing from the city to another region. Sonic and Tails set off to chase the airship.
Adventure Field	Central City
Mission 	Go to highways of Central City
Characters 	Sonic, Tails
Stage 	Lethal Interstate
Mission 	Chase the Black Arms' airship
Characters	Sonic, Tails
Allies 	G.U.N.
Enemies 	Black Arms
Sonic and Tails confront a few Black Arms led by a purple floating object with 6 tentacles on each side and an orange eye on the center. Sonic tells them to step away from the Chaos Emerald. The creature's eye shows a hologram of a Black Arm who introduces himself as Black Doom (he then calls the creature his third eye), and he leads the Black Arms, in which he calls themselves the most superior race in the world, more superior than humanity and the mobians. The reason he's here is to steal the Chaos Emeralds, use them to destroy Earth, and create it in their own image. He summons Black Bull to attack Sonic and Tails, who prepare for battle.
Boss 	Black Bull
Mission 	Defeat Black Bull
Characters	Sonic, Tails
Sonic and Tails defeat the Black Bull and the Emerald is secured. Doom's Eye departs from the City, warning Sonic they will take the Emerald from him soon. After the Black Arms leave Central City, a G.U.N. beetle robot approaches to Sonic and Tails. The beetle robot informs the duo that he is here to transport the two to G.U.N. headquarters to meet with Commander Tower who wants to see them for something urgent regarding the Black Arms. Though hesitant about it, Sonic agrees to meet with him, and soon the beetle teleports itself, Sonic, and Tails to the base.
Meanwhile, somewhere at a strange base, Black Doom, in his true form, is sitting on his throne, plotting to take the Emerald Sonic took as well as the others. He orders his second-in-command, Eclipse the Darkling, to lead the Black Arms to invade Emerald Town where a Chaos Emerald is located. As Eclipse and some aliens begin their mission, Black Doom laughs, confident on seeking the Chaos Emeralds and wrecking Emerald Town.
==Chapter 2: The Search Begins==
Sonic teams with G.U.N. in their quest to find the rest of the Chaos Emeralds before the Black Arms; meanwhile, the Black Arms invade Emerald Town and plot to decimate it with missiles from a nuclear plant.
We are taken to the White House where the President is looking out at a window inside his office. He gets a call from his secretary who reports that the G.U.N. troops have successfully driven the Black Arms from Westopolis as well as the five other districts. Currently, the Black Arms are wandering across other regions and Commander Tower is investigating their whereabouts. The President tells his secretary to tell the generals that they will never surrender to the Black Arms. As the call is over, he looks at a picture of Sonic, Tails, Knuckles and Amy which was taken after they saved the world from the ARK. Because of their bravery, the President declares that the United Nations must stand united against the Black Arms.
We return to Sonic, Tails, and the G.U.N. Beetle who arrive to G.U.N. Headquarters. The beetle directs them to the room where Commander Tower and Rouge are waiting. Rouge greets Sonic and Tails, but the Commander isn't very hospitable, and tells Sonic that he doesn't think too highly of his heroics. He explains that the reason why he brought him and Tails here is because he wanted their assistance in helping his soldiers in eliminating the Black Arms who have invaded several regions of the world searching for the Chaos Emeralds in each of them. Sonic explains that he already took one Emerald from the Black Arms. Commander Tower orders Sonic to give it to him so he can store them inside the secret vault.
On the topic of Emeralds, Sonic asks the Commander about why G.U.N. was after him for a crime he didn't commit. Commander Tower explains he was aware he didn't commit them; 50 years ago, a past G.U.N. Commander sent his men to exterminate all of those aboard the ARK because a professor defied their orders of shutting down Project Shadow because of the danger is imposes. They captured Shadow and sealed him in Prison Island. After hearing that Dr. Eggman released him years later, Commander Tower realizes this would jeopardize the organization's reputation to the point it will be shutdowned. This is why they used Sonic as a scapegoat to protect their reputation. Tails asks why they were after him for stealing a Chaos Emerald and why they stopped chasing him and Sonic afterwards. Commander Tower replies they did this to discover where Eggman was hiding, and sent Rouge to guide them to the ARK.
While appreciative of the help, Sonic tells Commander Tower he isn't comfortable in helping out an organization who were okay in killing everyone aboard the ARK because Shadow was dangerous and used him to cover up their deed. The Commander tells Sonic that he doesn't have much of a choice and neither does he himself, but they must put aside their differences to fight against the Black Arms. Commander Tower warns Sonic that if he doesn't succeed in saving the world from the Black Arms, he will have him arrested. Not phased by the warning, Sonic states that he doesn't let authority, let alone the military, tell him what to do and that he only saves the world because he wants to. Commander Tower retorts he will put the blue hedgehog on a leech one day, and then gives him his communicating device where he will tell him where to go. After this conversation, Commander Tower orders his soldiers to go to the beach to find a Chaos Emerald and orders Rouge to go with some soldiers at the Mystic Ruins to find the Emerald there. Before Rouge could do, he advises Sonic and Tails not to let Commander Tower's attitude get to them since he treats her the same way; she informs him that he has a strong dislike for Mobians. Sonic says he isn't worried about him and is only focused about saving the world. After this, they all went into their respective missions.
Adventure Field	G.U.N. Headquarters
Mission 	Use the transporter to go to Emerald Town
Characters 	Sonic, Tails
At Emerald Town, Amy is being attacked by some Black Arms soldiers. Sonic and Tails arrive and come to her rescue, eliminating the Black Arms. Amy thanks the two for the rescue and Sonic explains they must find a Chaos Emerald before the Black Arms and explains about their invasion in Central City. Amy offers to join the two and they head to Emerald Beach.
Adventure Field	Emerald Town
Mission 	Go to the beach
Characters 	Sonic, Tails, Amy
Stage 	Emerald Beach
Mission 	Find the Chaos Emerald
Characters	Sonic, Tails, Amy
Allies 	G.U.N.
Enemies 	Black Arms
Sonic, Tails, and Amy exit the beach. Then Amy becomes concerned. Since the Black Arms are at Emerald Town, she tells the others that Cream may be in trouble. Sonic, Tails, and Amy hurry to find Cream.
Adventure Field	Emerald Town
Mission 	Go to the suburbs of Emerald Town
Characters 	Sonic, Tails, Amy
Cream and Vanilla are gardening outside of their mansion until a number of Black Arms arrive and surround the rabbits. Soon enough, Sonic, Tails, and Amy came to the rescue, eliminating them. Cream, Vanilla, and Cheese thank them for saving them. Although Vanilla is upset that her garden is ruined by the aliens, but Cream tells her they will fix it, cheering her mother up. Just then, Commander Tower from Sonic's communicator tells him to head to the southwestern district to assist his men in eliminating the Black Arms. Amy asks Sonic who was talking to him. Sonic replies it was Commander Tower and reminds her of G.U.N. chasing after him to cover up Project Shadow. Amy feels uneasy of helping them, but Tails says they have no other choice. Cream asks Vanilla if she could help Sonic, Tails, and Amy, but Vanilla is unsure considering how much of a threat the Black Arms pose. Amy assures her that Cream will be fine and reminds her of the time she with the help of Sonic rescued her from Dr. Eggman. Though doubtful, Vanilla allows Cream to go with the others, and Cream promises not to get herself in danger. With that, Sonic, Tails, Amy, and Cream set off to fight the Black Arms.
Adventure Field	Emerald Town
Mission 	Go to Route 99
Characters 	Sonic, Tails, Amy, Cream
Stage 	Street Massacre
Mission 	Eliminate 45 Black Arms
Characters	Sonic, Tails, Amy, Cream
Allies 	G.U.N.
Enemies 	Black Arms
In the next scene, a Black Arms airship, piloted by Eclipse, is flying across the skies and it is approaching the nuclear plant far away from Emerald Town. Black Doom orders Eclipse to head to the Nuclear Plant and launch nuclear missiles inside the plant to destroy Emerald Town as well as other cities. Eclipse laughs and says that the explosion will be a show for him and his alien brothers to watch.
We now return to Sonic, Tails, Amy, and Cream who receive a call from Commander Tower. Sonic tells him they already eliminated the Black Arms in the suburbs. Not concerned about the heroes completing their mission, Commander Tower orders Sonic and his friends to go to the Nuclear Plant to stop the Black Arms as they are setting to destroy the cities with the nuclear missiles inside a laboratory. Now Sonic, Tails, Amy, and Cream set off to find the nuclear plant.
Adventure Field	Emerald Town
Mission 	Go to Nuclear Plant
Characters 	Sonic, Tails, Amy, Cream
Stage 	Nuclear Chaos
Mission 	Race to the laboratory!
Characters	Sonic, Tails, Amy, Cream
Allies 	G.U.N.
Enemies 	Black Arms
Sonic, Tails, Amy, and Cream confront Eclipse who is inside the missile room. He tells the heroes he has already set up the missile to target Emerald Town and it will launch in the next 5 minutes. Eclipse summons Black Cobra, a Black Arm shaped like a cobra, and attempts to prevent Sonic and the gang from stopping the missile. The four set off to fight off the Black Cobra with Eclipse on top of it.
Boss 	Black Cobra
Mission 	Defeat Black Cobra
Characters	Sonic, Tails, Amy, Cream
With only 20 seconds remaining, the heroes find out how to stop the missile from launching. Tails sees a computer monitor and tries to shut down the missiles. With only 5 seconds remaining, he clicks on the abort browser to stop it from launching with no problems at all. Emerald Town is safe. Sonic, Amy, and Cream congratulate Tails on stopping them. Tails, humbled, says this is the second time he saved a city from destruction, remembering the time he disabled Dr. Eggman's missile in Station Square. Commander Tower interrupts the celebration and tells the four to head to the Mystic Ruins to eliminate some Black Arms and rescue Rouge who is trapped somewhere in the Mystic Ruins. With that, Sonic, Tails, Amy, and Cream set off to the Mystic Ruins.
Adventure Field	Emerald Town
Mission 	Go to the Mystic Ruins
Characters 	Sonic, Tails, Amy, Cream
In the next scene, Eclipse, inside his airship tells Black Doom about Sonic and the others stopping the missile from launching. Surprisingly to him, Black Doom doesn't seem upset over this and informs him that he has discovered the Master Emerald at Angel Island. He tells Eclipse that while the Chaos Emeralds are their main priority, they would use the Master Emerald for extra power. Black Doom orders Eclipse to head over to Angel Island to seize it. The scene ends as Eclipse flies to Angel Island.
==Chapter 3: Jungles and Islands ==
Sonic and co. head to the Mystic Ruins where the Black Arms are searching for a Chaos Emerald; meanwhile, an army of Black Arms invade Angel Island with their sights on the Master Emerald.
The chapter begins with a scene taking place earlier during Chapter 2 where Rouge is in search of a Chaos Emerald at the Mystic Ruins. Just then, a group of Black Arms confront her. She attacks one of them, but another Black Arm from behind knocked her down, causing her to fall into a cave. The scene fades to black.
(In the current time, you are switched back to Sonic, Tails, Amy, and Cream, who have arrived to the Mystic Ruins)
Adventure Field	Mystic Ruins
Mission 	Head to the jungle
Characters 	Sonic, Tails, Amy, Cream
At the Mystic Ruins jungle, Big is fishing nearby a river at his hut with Froggy watching on. The peace was interrupted when his hut is destroyed by a swarm of lasers. Big is shocked as to what happened, and he finds out that it was a group of Black Arms who surround him. One of the Black Arms got in front of the duo and abducts Froggy. Big fights off the alien thus rescuing his pet. The other Black Arms come to attack Big, but using his fishing rod, Big eliminates them. His moment of relief ended when a bigger Black Arm, Black Oak, appears behind him. Before Black Oak could attack, Sonic and the others come to Big's rescue. Big thanks the others and tells him of the Black Arms' attack of his hut. Amy states that they'll fix Big's hut as soon as they eliminate the Black Arms. Sonic suggests that Big join the heroes for assistance in dealing with the Black Arms. Big agrees and they set off to eliminate the aliens.
Adventure Field	Mystic Ruins
Mission 	Head to the swamp
Characters 	Sonic, Tails, Amy, Cream, Big
Stage 	Jungle Retreat
Mission 	Eliminate 50 Black Arms
Characters	Sonic, Tails, Amy, Cream, Big
Allies 	G.U.N.
Enemies 	Black Arms
After clearing the stage, Sonic receives a call from Commander Tower who is impatient in rescuing Rouge. Sonic explains that there were some Black Arms around the jungle and he had to eliminate them. After the Commander Tower tells them to hurry up to rescue Rouge, the five set off to the ruins.
Adventure Field	Mystic Ruins
Mission 	Head to the ancient echidna ruins
Characters 	Sonic, Tails, Amy, Cream, Big
The heroes enter the ancient echidna city where they are met by Rouge who managed to find a way to escape the cave she was previously stuck in. Rouge informs the group that the Chaos Emerald is located far ahead the ancient ruins and that the G.U.N. troops have already eliminated a number of Black Arms, but there are still some out there. With Rouge joining along, Sonic, Tails, Amy, Cream, and Big set to find the Chaos Emerald.
Stage 	Lost Ruins
Mission 	Find the Chaos Emerald
Characters	Sonic, Tails, Amy, Cream, Big, Rouge
Allies 	G.U.N.
Enemies 	Black Arms
The six have already found the Chaos Emerald. As they escape, they are confronted by Black Doom's third eye. Angered they beat his soldiers to the Emerald, Black Doom calls forth Black Tarantula, a spider-like Black Arm, and orders it to destroy the heroes and seize the Emerald. Now Sonic and the others prepare for battle.
Boss 	Black Tarantula
Mission 	Defeat Black Tarantula
Characters	Sonic, Tails, Amy, Cream, Big, Rouge
The Black Tarantula is defeated. Rouge calls Commander Tower and tells him they all retrieved the Chaos Emerald. Commander Tower then informs them that an army of Black Arms have invaded Angel Island and they must immediately go there to stop them. Sonic and the others set off to Angel Island, knowing that Knuckles may be fighting the Black Arms at the Island.
Adventure Field	Mystic Ruins
Mission 	Head to Angel Island
Characters 	Sonic, Tails, Amy, Cream, Big, Rouge
Sonic, Tails, Amy, Cream, Big, and Rouge arrive to Angel Island. Before they could begin their mission, they feel a great rumbling in the island. It turns out that Angel Island is falling, meaning that the Black Arms have stolen the Master Emerald. Realizing this, the heroes set off to find Knuckles.
Stage 	Waterfall Garden
Mission 	Eliminate 50 Black Arms
Characters	Sonic, Tails, Amy, Cream, Big, Rouge
Allies 	G.U.N.
Enemies 	Black Arms
After the stage, we now switch to a scene where Knuckles and Julie-Su are fighting off an army of Black Arms. Soon enough, Sonic, Tails, Amy, Cream, Big, and Rouge come to the echidnas' rescue and they all eliminate the rest of the Black Arms. Knuckles tells the others that the Black Arms attacked him and Julie-Su at the Emerald altar, and Eclipse stole the Master Emerald, and ran off somewhere around Angel Island. The two echidnas were chasing Eclipse around the jungle, but have presumably lost them. Sonic assumes Eclipse may have an aircraft they used to get to Angel Island, and says he and the others go with Knuckles and Julie-Su to retrieve the Master Emerald from Eclipse. Knuckles then asks Sonic why is Rouge with them. Rouge explains that she is joining the heroes to fight off the Black Arms, and is willing to help get the Master Emerald back. While doubtful of Rouge's motives, Knuckles relents. Now the heroes must find Eclipse and bring back the Master Emerald.
Adventure Field	Mystic Ruins
Mission 	Head to the ancient palace
Characters 	Sonic, Tails, Knuckles, Amy, Cream, Big, Rouge, Julie-Su
Stage 	Paradise Relics
Mission 	Find Eclipse
Characters	Sonic, Tails, Knuckles, Amy, Cream, Big, Rouge, Julie-Su
Allies 	G.U.N.
Enemies 	Black Arms
The heroes find Eclipse who going towards his ship just ahead. Sonic blocks his way, knowing he's going to his spaceship. While Eclipse was going to attack, Knuckles comes and punches him, thus saving the Master Emerald. Eclipse recovers and decides to take down all of them in order to escape.
Boss 	Eclipse the Darkling
Mission 	Defeat Eclipse
Characters	Sonic, Tails, Knuckles, Amy, Cream, Big, Rouge, Julie-Su
The heroes manage to take down Eclipse, but to their surprise, Eclipse transforms into a larger form of himself, and attacks them. Before he could issue another attack, he receives a call from Black Doom that he must head to Blue Ridge Zone to find two Chaos Emeralds and that he must forget about stealing the Master Emerald. Reverting back into his size, Eclipse follows his orders and warns Sonic and the others he will destroy them all in his monster form the next time he encounters them. As Eclipse leaves with his aircraft, Sonic and the others recover and set to return the Master Emerald back to the altar.
Adventure Field	Mystic Ruins
Mission 	Go to the Emerald altar
Characters 	Sonic, Tails, Knuckles, Amy, Cream, Big, Rouge, Julie-Su
Sonic, Tails, Knuckles, Amy, Cream, Big, Rouge, and Julie-Su arrive to the altar. Knuckles puts the Master Emerald into the center of the shrine and soon Angel Island is floating again. The heroes discuss about the Black Arms and where did they came from. Sonic asks Knuckles and Julie-Su if they could join them in their battle against the Black Arms as well as finding the Chaos Emeralds. Knuckles declines at first since the Master Emerald is the main priority. Julie-Su insists that he should come and tells him the Black Arms may not return to Angel Island. Knuckles brings up other thieves as well as Dr. Eggman. Sonic then makes a point that the Black Arms want to destroy everything in the world and not just Angel Island, therefore Knuckles wouldn't be guarding the Master Emerald if the world is decimated. Somewhat convinced, Knuckles relents and decides to go along since he owes Sonic and the others for helping him save Angel Island from Eggman and the Dark Legion in the previous adventure as well as fighting off the Black Arms earlier.
He summons Tikal from the Master Emerald and asks her to guard the Master Emerald again as he teams up with the heroes as the world is threatened by the Black Arms. Tikal grants his request and wishes him and the others luck in their battle. After that's settled, Sonic receives a call from Commander Tower who informs the heroes that the Black Arms in Angel Island are eliminated and orders them to go to Blue Ridge Zone to find two Chaos Emeralds. And so they leave Angel Island.
==Chapter 4: Quest in Blue Ridge Zone==
The heroes go to Blue Ridge Zone to eliminate an army of Black Arms and find two Chaos Emeralds, with an old friend coming to their aid; Hearing the arrival of the Black Arms, Dr. Eggman decides to get involved in the battle with the help of his army, Metal Sonic, and a familiar face; Meanwhile, the Chaotix are on a mission to find some secret disks at Prison Island.
The chapter begins in a scene taking place at Egg Metropolis. Dr. Eggman, Metal Sonic, Orbot, and Cubot are watching the news which displays footage of the Black Arms attacking Central City as well as Emerald Town. Eggman is furious over this, stating that he can't take over the world if it's being decimated by the Black Arms. He commands Orbot and Cubot to launch the Egg Fleet as well as the badniks as they go and deal with the Black Arms. As the robots follow his commands, Eggman orders Metal Sonic to go to Blue Ridge Zone to find the two Chaos Emeralds he located, and tells him he will have someone to help him. The scene ends with Eggman and Metal Sonic heading inside a room where they see a cryogenic chamber.
(You now return to Sonic and the others who are at the main section of the Mystic Ruins)
Adventure Field	Mystic Ruins
Mission 	Go to Blue Ridge Zone
Characters 	Sonic, Tails, Knuckles, Amy, Cream, Big, Rouge, Julie-Su
As the heroes arrive to the forest areas of Blue Ridge Zone, they are confronted by four Black Oaks. Before they begin to charge at the heroes, Mighty the Armadillo steps in and takes down one of them. Sonic, Tails, and Knuckles recognize him and they have never seen their old friend in a long time. They all continue to eliminate the Black Oaks. After that, Sonic introduces Mighty to Amy, Cream, Big, Rouge, and Julie-Su. Cream points out Mighty's resemblance to Sonic, even though he is an armadillo. Sonic then asks Knuckles when did he meet Mighty. Knuckles replies he first met Mighty along with the Chaotix at Angel Island when they were battling Eggman and Metal Sonic. Then Sonic tells Mighty about the appearance of the Black Arms and how they were fighting against them. Mighty says he never heard of them until he got to Blue Ridge Zone and offers to join the heroes in their quest. Then Rouge calls for Commander Tower and asks him about the exact locations of the two Chaos Emeralds. Commander Tower says one is located at a canyon while the other is at a castle. Tails comes with a plan to split into two groups to shorten time, meaning that he and Sonic would pick their allies. Tails chooses Amy, Cream, and Big for his group which leaves Sonic with Knuckles, Rouge, Julie-Su, and Mighty. With that settled, the two groups set off to find the respective Chaos Emeralds.
Adventure Field	Blue Ridge Zone
Mission 	Go to the canyon
Characters 	Sonic, Knuckles, Rouge, Julie-Su, Mighty
Sonic, Knuckles, Rouge, Mighty, and Julie-Su arrive to the canyon. Mighty then asks Sonic if Amy is his girlfriend, which makes the blue hedgehog embarrassed. Knuckles notifies the others that the Emerald is far ahead. Rouge states she plans on catching the Emerald because she's a "real treasure hunter", which leads to an argument between her and Knuckles. Sonic tells the others to ignore the two and keep going. Knuckles and Rouge realize the others are leaving them behind and catch up with them.
Stage 	Glyphic Canyon
Mission 	Find the Chaos Emerald
Characters	Sonic, Knuckles, Rouge, Mighty, Julie-Su
Allies 	G.U.N.
Enemies 	Black Arms
(You are now switched to Tails, Amy, Cream, and Big)
Adventure Field	Blue Ridge Zone
Mission 	Go to the castle
Characters 	Tails, Amy, Cream, Big
Tails, Amy, Cream, and Big arrive to the castle which it turns out to be spooky looking. Cream is frightened of the castle, but Amy and Big comfort her. Tails states that his Emerald radar is picking up a signal that a Chaos Emerald is far ahead and that the Black Arms are around as well. With no time left, the four brave ahead head inside the creepy castle.
Stage 	Cryptic Castle
Mission 	Find the Chaos Emerald
Characters	Tails, Amy, Cream, Big
Allies 	G.U.N.
Enemies 	Black Arms, Eggman Empire
Tails, Amy, Cream, and Big have acquired a Chaos Emerald. Before they could leave the castle and find the others, Dr. Eggman, inside his Egg Breaker robot, confronts them. He tells the four he was looking for the Chaos Emerald and demands Tails to give it to him. Tails refuses, and Eggman threatens to destroy them just as he will to the Black Arms. Thus, the four heroes prepare to battle the Egg Breaker.
Boss 	Egg Breaker
Mission 	Defeat the Egg Breaker
Characters	Tails, Amy, Cream, Big
In the next scene, we are taken to Prison Island, which was isolated and destroyed after Eggman's previous attack in Sonic Adventure 2. Vector, Espio, and Charmy are at a jungle in the midst of Prison Island. They are currently on a case to uncover the Space Colony ARK's lost files regarding Project Shadow. They arrived to the island to search for an underground laboratory where it contains a floppy disk.
Stage 	Prison Island
Mission 	Find the hidden laboratory
Characters	Vector, Espio, Charmy
Allies 	G.U.N.
Enemies 	Black Arms
After finding the hidden laboratory, Vector, Espio, and Charmy find the floppy disk inside the computer. Charmy asks Vector what is Project Shadow. Vector replies that he doesn't have any idea what it is, but they would have to find out later. The detective trio leave Prison Island.
(You return to Blue Ridge Zone with Sonic)
Adventure Field	Blue Ridge Zone
Mission 	Meet up with Tails and the others
Characters 	Sonic, Knuckles, Mighty, Rouge, Julie-Su
Sonic, Knuckles, Mighty, Rouge, Julie-Su meet with Tails, Amy, Cream, and Big. Each of the party have found a Chaos Emerald. Amy tells Sonic about encountering Dr. Eggman at the castle and that he's after the Chaos Emeralds, which doesn't surprise the blue hedgehog, knowing that the mad scientist will get involved in this. Just then, Commander Tower informs the group that an army of Black Arms are at the snowy tundras and orders them to eliminate them. The heroes begin their mission.
Adventure Field	Blue Ridge Zone
Mission 	Go to the tundras
Characters 	Sonic, Tails, Knuckles, Amy, Cream, Big, Rouge, Julie-Su, Mighty
Stage 	Cold Tundras
Mission 	Eliminate 60 Black Arms
Characters	Sonic, Tails, Knuckles, Amy, Cream, Big, Rouge, Julie-Su, Mighty
Allies 	G.U.N.
Enemies 	Black Arms, Eggman Empire
The heroes are confronted by Doom's Eye again, who is furious that they've found the two Chaos Emeralds before them. He summons Black Golem to destroy them and take the Emeralds from them. Sonic and the others prepare for battle against yet another alien creature.
Boss 	Black Golem
Mission 	Defeat the Black Golem
Characters	Sonic, Tails, Knuckles, Amy, Cream, Big, Rouge, Julie-Su, Mighty
Sonic and the others seemingly defeat the Black Golem, but it turns out the Black Golem recovers and issues a huge attack on the heroes. This also resulted in Sonic dropping the two Chaos Emeralds they recently found. Black Doom is pleased of this and a small group of Black Arms take the Emeralds. Black Doom orders the Black Golem to crush the heroes once and for all. Just when the Golem goes on to smash the heroes, two individuals arrive and take out the group of Black Arms, taking the Chaos Emeralds in the process. The first person revealed is Metal Sonic, and second person is none other than Shadow, which surprises Sonic, Tails, Knuckles, Amy, and Rouge. Shadow and Metal Sonic charge through the Black Golem's chest, thus destroying it completely. After the deed is done, Shadow uses Chaos Control to teleport both of them to another location. This leaves the heroes in surprise and confusion. The screen fades to black.
==Chapter 5: The Enemy of my Enemy==
Dr. Eggman seeks the heroes' help in defeating the Black Arms who are attacking his army, but can he be trusted?; Also, Commander Tower has something of a grudge against Shadow and orders the heroes to destroy him, but will they follow his command?
The chapter begins at G.U.N. HQ where a G.U.N. soldier informs Commander Tower that the Black Arms have been successfully eliminated, but the two Chaos Emeralds the heroes acquired throughout Blue Ridge Zone have been stolen by Metal Sonic and Shadow. Commander Tower scowls at the mention of Shadow's name and orders the soldier to eliminate Shadow and the forces of Dr. Eggman. Puzzled, the soldier asks if Shadow is on their side considering he once saved the world along with Sonic. Commander Tower brushes it off, claiming that Shadow is a threat to the world, and sternly tells the soldier to carry out the given orders. The G.U.N. soldier does so, but is still doubtful. With the soldier leaving the room, Commander Tower then says that Shadow will pay for his crimes.
Back at Blue Ridge Zone, the heroes return from the tundras and have been quiet upon their journey. Sonic, Tails, Knuckles, Amy, and Rouge were thinking to themselves about Shadow's return and wonder why is he taking the Chaos Emeralds and escaped with Metal Sonic. Mighty and Julie-Su break the silence, asking the five about who Shadow is. Sonic and the others explain to them, and to Cream and Big, that Shadow once helped them save the world from the Space Colony ARK, but after that, he fell down to earth, and they thought he never survived. Knuckles then brings up about Shadow escaping with Metal Sonic with the two Chaos Emeralds and assumes that Shadow is working for Dr. Eggman. Amy assumes that he may be brainwashed by Eggman, which others agree that it may be a possibility. Just then, Commander Tower informs the heroes that he spotted Eggman's fleet far from the canyons and orders them to head into an aircraft where they will fly up to Eggman's fleet to retrieve the Chaos Emeralds and then tells them to eliminate Shadow. Rouge tells them that they can't attack Shadow because he's on the side of good, but Commander Tower berates her for questioning him and severely warns the heroes that should they choose not to capture Shadow, they will be a target just as much as Eggman and the Black Arms are.
Now the heroes discuss how to take action. While they have no problem dealing with Eggman, they aren't sure about Shadow. Knuckles points out that if they don't attack Shadow, Commander Tower will send his army against the heroes, meaning that they would be dealing with three factions - G.U.N., Eggman Empire, and the Black Arms. Sonic resolves that they all go and find Shadow to see what's going on with him instead of having to attack him directly. The others agree. What's left now is that they must find the location of Eggman's fleet which is where Metal Sonic and Shadow have presumably transported into. Rouge informs the others that there is a ship waiting for them and they must hurry. And so the heroes set off.
Adventure Field	Blue Ridge Zone
Mission 	Find the G.U.N. ship
Characters 	Sonic, Tails, Knuckles, Amy, Cream, Big, Rouge, Julie-Su, Mighty
We are taken to a scene which takes place after the end of Chapter 4. Shadow and Metal Sonic, via Chaos Control, appear inside the main room of the Egg Carrier where Eggman, Orbot, and Cubot are waiting. Eggman applauds the two for retrieving the Chaos Emeralds, but the celebration ends when Shadow suddenly collapses to the ground. Eggman realizes that Shadow had depleted all of his Chaos Energy by using Chaos Control, and that the cryogenic chamber didn't fully charge him. He orders Metal Sonic to put him into another chamber inside the fortress. While Metal Sonic does that, Orbot brings up Shadow's inhibitor rings which keep him from using all of his powers. Cubot notes that Sonic gave the rings to Rouge. This gives Eggman an idea to send out his Egg Drone to find Sonic and the others and bring them into the base.
Back to the current time, Black Doom, Eclipse, and the rest of the Black Arms are at Glyphic Canyon watching the Egg Fleet from a far distance. Knowing they're going to attack them, Black Doom commands the ruins to rise up from the ground. The ruins of Glyphic Canyon are rumbling and begin to float high in the sky. The heroes, G.U.N., and Eggman watch in awe. Black Doom states to Eclipse that he had transported the flying fortress to earth for over 2,000 years ago. Eggman, shouting from the speakers, threatens to decimate the fortress with the Black Arms in it. Black Doom orders Eclipse and the other Black Arms to prepare for battle.
At the G.U.N. ship, Sonic and the others arrive to Eggman's fleet, knowing that the Black Arms will begin their attack. They exit the aircraft and before they could set off to infiltrate Eggman's fortress, the Egg Drone appears and sends them inside the main room of Egg Carrier. They were surprised they didn't have to run all the way to the flying fortress. Eggman, Metal Sonic, Orbot, and Cubot come to see them, and to their surprise, he tells them he isn't going to harm them. He explains to them that he sent the Egg Drone to teleport them here for two things, the first being Shadow's inhibitor rings. Rouge, realizing what he meant, asks Eggman if Shadow is here. Eggman shows everyone the cryogenic chamber where Shadow is encrypted and explained that he was placed in there because he ran out of Chaos Energy after using Chaos Control; restoring his energy with the chamber is taking too much time. Metal Sonic releases Shadow from the chamber and Rouge puts the inhibitor rings on Shadow's wrists, thus fully restoring his power.
As Shadow awakes, he notices Sonic and the others, and doesn't recognize them. Sonic, Tails, Knuckles, Amy, and Rouge are surprised about this, but Shadow explains that he remembers being inside Eggman's base in the chamber and Eggman found him unconscious in the Mystic Ruins jungle beforehand. Eggman explains to the others that Shadow is suffering amnesia and needs to regain his memories, but they would have to deal with the Black Arms first, which is why he asks the heroes for his help. The heroes were surprised, especially Sonic, who never expected his arch enemy asking for help. Knuckles and Julie-Su were vehement about the idea of helping Eggman, considering he helped the Dark Legion attack Angel Island and the echidnas during the Enerjak Saga. Eggman tells all the heroes to put aside their hostility and then tells them that the Black Arms' armada contains 4 energy orbs that keep it afloat, and that they need to be destroyed. He asks Tails, Amy, Cream, Big, Julie-Su, and Mighty to help defend his fleet from being attacked and which leaves Sonic, Knuckles, Rouge, Shadow, and Metal Sonic to destroy the orbs. With the heroes putting aside their differences against Eggman, they all go on their respective missions to take down the fortress.
Stage 	Egg Squadron
Mission 	Destroy 4 of the Black Arms' fleet
Characters	Tails, Amy, Cream, Big, Julie-Su, Mighty
Allies 	Eggman Empire
Enemies 	Black Arms
Meanwhile, Sonic, Knuckles, Rouge, Shadow, and Metal Sonic arrive to the flying fortress of the Black Arms. Rouge receives a call from Commander Tower and impatiently asks her about Eggman. Rouge breaks the news that they are helping him to battle the Black Arms. Commander Tower is displeased with this and berates the heroes for assisting the enemy, but Rouge tells him it's only temporary. Commander Tower relents and tells them to take out the Black Arms and then continue to deal with Eggman. Rouge sighs in relief that he didn't mention Shadow. After this, they all begin to find the cores of the fortress. The scene ends with Shadow still pondering who Sonic and the others are, but decides to focus on his current mission first.
Stage 	Sky Troops
Mission 	Destroy 4 Orbs
Characters	Sonic, Knuckles, Rouge, Shadow, Metal Sonic
Allies 	G.U.N., Eggman Empire
Enemies 	Black Arms
Sonic, Knuckles, Rouge, Shadow, and Metal Sonic successfully destroyed the orbs and the ruins are falling into the ground. The Black Arms' fortress returns to the ground, and Eggman gloats with victory, declaring that his fleet will live another day. Black Doom, inside his secret base, is outraged. But he notices Shadow's presence on a monitor, and appears to know him as the Ultimate Life Form created by Prof. Gerald. The scene fades to black.
In the next scene, Eggman, Orbot, and Cubot are interrupted by Commander Tower from the monitor. He tells him about the Black Arms' fortress falling back on the ground, and then threatens to send his army to eliminate him. After a brief argument, Eggman tells him that they must continue working together to fight against the Black Arms, and says he received a signal that an army of Black Arms are invading Egg Metropolis. Commander Tower tells Eggman he isn't here to protect Egg Metropolis, he's focused on eliminating the aliens. He then promises to dethrone him after their alliance is finished.
Meanwhile, Sonic, Knuckles, Rouge, Shadow, and Metal Sonic are at the ruins waiting for the G.U.N. airship to arrive. Shadow and Metal Sonic receive a call from Eggman, who respectively orders them to find a Chaos Emerald at Prison Island and meet with him at the Egg Fleet immediately. As Shadow and Metal Sonic leave, the aircraft arrives, and Sonic, Knuckles, and Rouge enter inside. Amy asks Sonic about Shadow and Metal Sonic and he replies they went to take care of some business. Commander Tower soon calls the heroes and orders them to go to Egg Metropolis to eliminate an army of Black Arms, and then asks one of them to find a Chaos Emerald located at Prison Island. Rouge offers to volunteer. Commander Tower then reminds them of his command to capture Shadow. With Rouge leaving the group to go to Prison Island, the heroes set to follow the Egg Fleet to Egg Metropolis.
In the next scene, the heroes arrive to Egg Metropolis and seek to eliminate the Black Arms.
Stage 	Iron Wilderness
Mission 	Eliminate 55 Black Arms
Characters	Sonic, Tails, Knuckles, Amy, Cream, Big, Mighty, Julie-Su, Metal Sonic
Allies 	G.U.N., Eggman Empire
Enemies 	Black Arms
During the battle between the heroes and the Black Arms, we go to a scene taking place inside the main tower of Egg Metropolis. Inside are Vector, Espio, and Charmy whose mission is to transfer the ARK's hidden files into Vector's disk. Espio is hacking Eggman's computer, trying to activate its portal, but the process is taking longer than expected. Impatient over this, Charmy smashes the keyboard and this opens a portal to Eggman's database. Now the detective trio head inside the portal to extract the files.
Stage 	Mad Matrix
Mission 	Activate 4 Terminals to extract the ARK's files
Characters	Vector, Espio, Charmy
Enemies 	Eggman Empire
The Chaotix have a extracted the hidden files of the ARK and are searching for the exit of the database. Standing in their way, however, is a giant red wall with Eggman's face in it. It is known as the Egg Virus and it was designed by Eggman to stop intruders in his database. Vector, Espio, and Charmy prepare for battle against the Egg Virus.
Boss 	Egg Virus
Mission 	Defeat the Egg Virus
Characters	Vector, Espio, Charmy
Vector, Espio, and Charmy exit the portal of Eggman's database. Vector takes the disk which have already taken the ARK files, and thus, the trio of detectives set to leave the tower.
(You now switch to Sonic and the others)
Adventure Field	Egg Metropolis
Mission 	Head to the center of the base
Characters 	Sonic, Tails, Knuckles, Amy, Cream, Big, Vector, Espio, Charmy, Mighty, Julie-Su
Sonic and the others are still searching for Egg Metropolis meet Vector, Espio, and Charmy who were just leaving from the interior of Egg Metropolis. The Chaotix were especially excited to see Mighty since they haven't seen each other for a long time. Vector tells the heroes about their mission to collect the files from the ARK and offers to assist the heroes to fight off an army of Black Arms since they heard of their invasion. Sonic accepts their help and now they must head to Old Megaopolis where the rest of the Black Arms are wandering.
Adventure Field	Egg Metropolis
Mission 	Head to Old Megaopolis
Characters 	Sonic, Tails, Knuckles, Amy, Cream, Big, Vector, Espio, Charmy, Mighty, Julie-Su
Stage 	Old Megaopolis
Mission 	Eliminate 60 Black Arms
Characters	Sonic, Tails, Knuckles, Amy, Cream, Big, Vector, Espio, Charmy, Mighty, Julie-Su, Metal Sonic
Allies 	Eggman Empire, GUN
Enemies 	Black Arms
The heroes are confronted by another Black Arm creature called the Black Phoenix. The heroes prepare for battle.
Boss 	Black Phoenix
Mission 	Defeat Black Phoenix
Characters	Sonic, Tails, Knuckles, Amy, Cream, Big, Vector, Espio, Charmy, Mighty, Julie-Su, Metal Sonic
After defeating the Black Phoenix, Dr. Eggman congratulates the heroes for preventing Egg Metropolis from being invaded and destroyed by the Black Arms. The mad scientist tells Sonic that Metal Sonic wants to give him a "token of gratitude", in which Metal Sonic electrocutes the heroes, signaling the end of their alliance. As a result of the attack, Sonic drops the three Chaos Emeralds he had found in the previous chapters, and they are stolen by Metal Sonic. Eggman arrives and applauds Metal Sonic for stealing the Emeralds and taunts the heroes for letting their guard down. The two depart to Egg Metropolis with the heroes watching in agony.
Meanwhile, Shadow is at an island where he sees Prison Island from a far. He heads to Prison Island where Rouge follows behind. She knows that Prison Island is guarded by some G.U.N. mechs, and can't let them spot her assisting Shadow. As she follows him, watching from a distance is Doom's Eye. The scene fades to black.
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