Sonic VS the Monster from Underground/The Volcanic Venture

**Sonic VS the Monster from Underground** or **The Volcanic Venture** is the forty-eighth episode of Sonic X: Heroes Forever.

## Characters

* Sonic the Hedgehog
* Miles "Tails" Prower
* Amy Rose
* Rouge the Bat
* Shadow the Hedgehog
* E-123 Omega (Does not speak)
* Cream the Rabbit
* Cheese the Chao
* Chuck Thorndyke
* Doctor Atsumi Cadberry
* Antoine D’Coolette
* Bunnie D’Coolette
* Rotor Walrus
* Sir Charles Hedgehog (Does not speak)
* Payback Fox
* Dulcy the Dragon
* Silver the Hedgehog
* Blaze the Cat
* Marine the Raccoon
* Sally Acorn
* Sonia the Hedgehog
* Manic the Hedgehog
* Mina Mongoose (Does not speak)
* Mighty the Armadillo (Does not speak)
* Ray the Flying Squirrel
* Fiona Fox (Mentioned)
* NICOLE
* Shard the Hedgehog (Does not speak)
* Shade the Echidna (Does not speak)
* Sleet
* Dingo (Does not speak)
* Scratch
* Grounder
* Coconuts
* Topaz McCarther
* Hope Kintobor
* Abraham Tower
* Christopher Thorndyke
* Mr. Tanaka
* Mr. Hanson
* Mr. Smith
* Ella (Does not speak)
* Dr. Eggman
* Snively Robotnik
* Decoe
* Bocoe
* Bokkun
* Mothmacin (only appearance)
* Mongroun (only appearance)
* Aurora (mentioned)
* Moby Deep (mentioned)
* Brandon Mutt
* Riff
* Blake Prisma
* Rachael Hops

## Plot

The episode begins with Eggman and his group escaping the events of the previous episode. Sleet is complimented on his bluff by Eggman. Meanwhile, the heroes are ashore on the island, which smells of sulfur, disgusting most of the heroes. All apart from Dulcy, who was reminded of her home. Silver, Blaze, and Marine also have a tolerance for the smell since they come from a timeline where everything is on fire. Sally tells everyone that they need to get moving.

Meanwhile, Hanson and Smith are accosting Topaz for not putting up a good fight against Eggman, only for Abraham to put a stop to them. Clearly affected by Hanson & Smith’s words, Topaz, accompanied by Mr. Tanaka, goes off to clear her head.

With Hope, Chris, and the other Mobians, Tails manages to land the X Tornado. Rouge was asked if she’s comfortable with asking, and Rouge complies. Topaz and Mr. Tanaka return shortly with a box that turns out to be made of ermurasium, an element unique to the island. This enamors Rouge, but, is quickly scolded saying that there’s a difference between archaeology and treasure hunting.

Back with Eggman and his minions, they’re inside of the volcano and searching. A short time later, the Mobians arrive and Tails readies everyone to search in the volcano. The groups go inside the volcano and, facing against dead ends and alternate tunnels, the heroes come across unusual sights like fluorescent moss. Sonic theorizes that it might be one of the materials refined to make ermurasium.

Meanwhile, Eggman and his minions are camping in the volcano and Eggman sends Decoe and Bocoe to look for some food. This frightens the two, wary of possible danger. However, Eggman threatens to send them to the magnet room, convincing them to go.

The Mobians come across an underwater stream, which fills Blaze with unease. Water makes her fur heavy and inhibits her fire powers. Luckily, Sonic brought Aqua Shield capsules with him so that they can help the others. Blaze uses hers right away. After crossing the stream, they hear running water. Once they follow it, they discover a waterfall. They use vines to climb out of danger. Blaze is reluctant due to acrophobia. After finishing their climb, Decoe and Bocoe enter while running away in a panic. The heroes are confused by this. The two bots explain the situation indirectly.

Back with Tails and his group, Tails finds a tunnel that the X Tornado can fit through. He changes the X Cyclone into the X Tornado and flies through said tunnel. The two Mobian teams meet up with each other inside the volcano.

Back with Doctor Cadberry’s group, he makes a discovery about Murasian civilization’s technology being more advanced than their own thanks to footage sent to him from the X Tornado. He even points out an artificial sky that they made. Dr. Cadberry even mentions that they worshiped dragon-like creatures. Though, when he mentioned that they were believed to accept sacrifice, this upsets Dulcy. Cream suggests proving the stereotype wrong and Chris suggests she does so by helping Sonic’s group out. Cream, Amy, and Cheese tag along to venture into Murasia while Antoine, Bunnie, and Rotor search for usable parts in the Battleship with several others. Once inside, they hear a deep rumble: an earthquake before the volcano erupts. Amy sees a tunnel they can go through. Most of them can walk through it easily, but, Dulcy ends up stuck partway. This causes her to panic. Cheese uses his calming powers to calm Dulcy and this helps her. Dulcy relaxes enough that she lays on her belly, giving her enough wiggle room to crawl. Cream then calls Tails on her Wrister to get some help, to which he offers advice that helps Dulcy. She crawls back the way she came in and carries the rest of Team Rose through the alternate tunnel. They then search for their friends, which was easy since they were close by. The girls are amazed by the beauty.

We rejoin Decoe and Bocoe as they search for food for Eggman. Bocoe finds a slug. They soon find what they believe is a giant cherry for Eggman’s dessert. When they try to move it, however, it turns out to be attached to a giant moth-like creature called Mothmacin. The creature targets them and they run and scream like there’s no tomorrow. They pass the heroes with Mothmacin in pursuit. The heroes worry about Mothmacin approaching them,  but, it passes by them and pursues Decoe and Bocoe, since it’s territorial. Amy feels sorry for Decoe and Bocoe, much to Manic’s surprise. Amy decides to help the robots anyway. Although, this now means that Mothmacin now targets Amy and her friends as threats after Any throws a rock at it. This action fills Bocoe and Decoe with happiness as they learn they were being saved. Amy worries she’s becoming too sympathetic for her own good. Decoe, Bocoe, and Amy then end up sliding down a tunnel and encounter Eggman face to face. Seeing Amy makes the villain feel nostalgic. Even if she was outnumbered, Amy still fights them and pummels Eggman excessively. Unfortunately, all it takes is for someone to mention that Amy was like a demon to put her into a panic attack. The villains use this opportunity to incapacitate her.

At that time, however, the volcano was preparing to erupt. The various parties prepare to evacuate. Manic and Rouge set off to recover Amy and find signs of Eggman’s camp. Rouge also finds a deposit of gems and jewels at the camp. She manages to shake off her greed and carefully select who gets what.

A short time later, Eggman and his group find a large temple. Amy is in her guilt-tripping stupor, much to the annoyance of the others. Eggman orders her to be slapped out of it. Grounder obliges by bonking Amy on the head, knocking her out of her stupor. Eggman then orders Scratch to give him a detonator. While this was going on, Bokkun was sitting on a statue that resembles Godzilla. Another earthquake causes said statue to crumble and up rises a giant robot named Mongroun. Sleet thinks that because Mongroun is an Earth robot, he doesn’t serve as a threat. His mind changes when Mongroun breathes fire near them. Rouge swoops in and rescues Amy. They reunite with the others and Manic comforts Amy after she apologizes.

Mongroun then begins smashing buildings and Decoe and Bocoe dodge the rubble. They try to reach for the detonator only to discover Eggman and his other henchmen leaving without them.

As the volcano gets more unstable, Decoe and Bocoe explain about the detonator about to go off, concerning the others. Amy and Manic go to retrieve the bomb while Rouge warns the others. Mongroun detects Amy and Manic, but, Rouge distracts him. Her attacks do little more than irritate the robot. Amy and Manic manage to retrieve the detonator.  Amy gets an idea, but, Decoe and Bocoe offer to help them. They tell the two Mobians of their respective Speed and Power-Type abilities, but, this doesn’t work. They try to form another plan, but, Mongroun smacks the two robots with its tail, decimating them into spare parts. Mongroun is about to attack them, but, it’s hit by a missile. The missile is revealed to have come from the X Tornado. The missile does not damage Mongroun, though. Shadow removes his Inhibitor Rings to become Chaos Shadow and battle the robot himself. His efforts only cause a single dent. It’s then that Amy gets the idea to use the detonator against Mongroun, essentially killing two birds with one stone. In surprise, Rouge admits that this is the smartest plan Amy had all day. So, while Rouge distracts Mongroun, Sonic uses his speed to put the detonator into the mouth-like vent. The bomb goes off inside the robot. The tremors from the explosion cause the volcano to erupt and the others evacuate.

After getting to safety, Amy worries about Decoe and Bocoe. Hope tells her about a burlap sack bundle to ease her mind. It turns out that the sack had the remains of Decoe and Bocoe, which were being reassembled. Rouge also hands Dr. Cadberry a big red jewel for the museum. Decoe and Bocoe explain that they’re built to be servant-class robots. They decide to quit serving under Eggman. Hope and Amy hold their heads so they can shout their resignation.

## Differences between the episode and this version:

* In the episode, Chris went with the Mobians to Murasia and befriended Decoe and Bocoe. In the chapter, he stays behind and Amy befriends the aforementioned robots instead. Manic later finds Amy and joins her.
* Neither Mothmacin nor Mongroun speak in the episode.
* Ermurasium in the episode was called harahirecon in the Japanese version. This chapter uses both names.
* Knuckles accompanies Sonic and Rouge in the volcano in the real episode. In this version, Sonic and Rouge are with Sally, Blaze, Silver, Shadow, Sonia, and Manic.
* Cream is with the crew on the mission. In the real episode, she stayed behind.
* Decoe and Bocoe mention they were in ‘dream mode’ when they figure they can’t turn into a powerful fighting machine. Here, they say Eggman must have programmed them with the thoughts of doing such a thing.
* Dulcy gets caught while trying to find her way inside the tunnel.
* Shadow replaces Knuckles in the final fight with the Mothmacin.
* Rouge gathers some gems for herself, her mother and the museum, while in the episode, her gem she got for herself was taken away by Dr. Cadberry.
* Eggman gives a headcount of all his fellow members of the Eggman Empire and the weapons they have. If this happened in the real episode, it’d be really cut down.
* Amy still has PTSD from the GX Amy incident. This of course didn’t happen in the real episode.
* Rouge mentions that the reason why she can’t kick the Mothmacin because she left her Iron Boots at home.

## Trivia:

* The episode references GX Amy when Amy pummels Eggman. This marks one of the few times Re: Heroes Forever GX is referenced in the series proper.
* Brandon mentions that his author caught COVID while writing this episode. This was indeed the case.
* This episode is one that RifftheWolf struggled the most to write as he was working at the time the episode was being written.
* Dulcy mentions her life in Vesuvio.
* Dulcy joins Team Rose in this story as the second Power-Type after Big.
* Chris compares Shadow to Vegeta in this episode.