So basically, Eggman gets the prism again. Sonic and Tails and everyone come to fight him, and Eggman hits Sonic with the prism. If it were any other rock this wouldn’t be a huge problem, but this leaves what looks like a large glowing crack in Sonic’s chest.
the others continue to fight. As the cracks start to grow and new ones form in his face, arms and legs, the prism starts glowing brighter.
then, all of a sudden, Sonic screams out in pain and he and the crystal sort of… explode.
Shadow is the first one to come to. Everything looks more or less normal, other than the fact that everyone’s unconscious and the prism has turned into a swirly rainbowy portal-looking thing.
Tails is next to wake up. He realizes Sonic is gone and flies into a panic. He runs off, Shadow goes after him to make sure he doesn’t do anything too impulsive.
after a while, they sort of find Sonic. He looks like a hologram, pays no attention to anything, and keeps repeating the phrase “What you see is what you get—just a guy who loves adventure!”
Tails is confused and alarmed, but Shadow knows what’s going on. It’s a repeat of Sonic Prime, sort of. But Sonic seems to be the only thing that was shattered—Big and Froggy are normal, Eggman’s normal, almost everything is normal. Not even the prism was shattered this time, it was more blended together.
Shadow tries to comfort Tails, and they decide the solution is to go into the void and see what they can see.
of course, they have no way to get into the void because no one has any prism energy inside. They decide to go talk to Knuckles, Amy and Rouge (who have tied up the still unconscious Eggman.)
They don’t have any ideas either. While they’re talking, Tails’ eyes drift to the swirling light that used to be the prism. He stares for a while, thinking. Wondering.
then surprises everyone by jumping into it.
The others panic and end up going into it themselves. It turns out, the prism has turned into a portal into the void, complete with a rainbowy gateway to their world. Tails is standing on a crystal, awestruck.
After a brief explanation from Shadow on where the heck they are, they run off toward a random gateway to hopefully find sort of clue.
Also Tails is going to feel really guilty about what happened to Sonic.
they end up finding these guys, who were written in by the prism in a way that they wouldn’t change what happened with the original Sonic when he broke the prism:
More info on them and their friends:
The New Yolk City Sonic I think has the best backstory. He was friends with that world’s Amy before the Chaos Council took over. When they did, the two hedgehogs tried to fight back, but both were captured and turned into cyborgs. For a while, he and her were a matching set of enforcers, Rusty Rose and Scrappy Sonic. Then, he found a chaos emerald while patrolling and it restored his free will. He panicked when he saw his robotic body and ran off to look for Amy. When he found her, however, she recognized that he was no longer under the Council’s control and ordered some robots to terminate him. He survived, but did take some damage.
Ghost, Zip and Crash were a second resistance group with no knowledge of the existence of the first. They operated on Angel Island and protected the Master Emerald. They would also sneak down and cause trouble the council in new yolk.
They were sneaking in the sewers when they came across an unconscious blue cyborg. They decided to wake him up. Half asleep, he said “Amy-bzzrt-Rose…” they asked what that meant, but he found himself unable to say anything after that.
Since he couldn’t tell them his name, the Chaotix nicknamed him “Lucky” because he was very lucky to get free of the council’s control.
He still can’t talk, but his new friends have gotten very good at understanding his charades. Especially Ghost, who can practically read his mind.
Nine was overjoyed when he met Lucky, although didn’t show it. This was a guy who was just like the hedgehog who had tried to be his friend, who was nice to him when no one else was, almost identical in body and in personality! And his home was right here. He could stay with him. He was mute, but Nine felt like Sonic talked too much anyway.
In Boscage Maze, there was another group of scavengers that was more mindful of the jungle, so Thorn let them stay. They had their own version of her, named Briar. He was also a protector of the forest, and even had the power to control the plants. Imagine Gnarly’s confusion when a vine grabs his ankles and lifts him upside down. Poor echidna nearly has a heart attack.
Briar means well, though. He just likes to put newcomers through their paces.
Poison Ivy does have her fire powers, but being in the middle of a bunch of trees rarely uses them. Most people don’t even know she has them, so that comes as a shock when she comes to the void and fights the Eggforcers.
And finally, No Place. These three sail on a ship called The Chaos. Just them. Polly is a flicky that refuses to leave the ship.
One day, the Chaos is attacked by what the crew thinks is a kraken. Shipwrecker recognizes it as a version of iblis that is made of water rather than fire, and that flooded the planet years ago. Shadow gets knocked overboard and sees a chaos emerald underwater. He tries to get it, but is knocked unconscious by a rock to thrown by iblis. Sapphire panics, since he is terrified of water, but summons the courage to dive in and pull his captain back onto the ship. He sees the emerald, and thinking that Shipwrecker was trying to get it grabs that too before returning to the surface.
When the captain comes to, he reveals to his crewmates that he now has all of the chaos emeralds, and he and his crew go into super form and defeat iblis, restoring the water to its original level. As they explore their new surroundings, they see hedgehog's pass and the loop-de-loop. Sapphire ends up falling flat on his face because the loop was damaged by Dread's submarine. They fix it by making a replacement section with wood. It's like a bridge that curves.
then, they race. The starting line is drawn, the route is set, and they're all determined to prove they're the fastest of the bunch.
Shiver falls behind pretty quickly. For the rest of the race, it seems like it's going to be a photo finish between Sapphire and Shipwrecker. Then, the captain stumbles over something. allowing sapphire to take the lead. He's about to win when he sees Amy, then same way Sonic sees Shadow when he's running really fast in prime. She grabs him and pulls him through the gateway.
From Shiver and Shipwrecker's perspective, Sapphire just sort of popped out of existence, so they're confused and angry. This group is for this au what Nine was for prime. Sapphire is also being really uncooperative and slowing their progress to get the original Sonic back.
Which they still have no idea how to do, by the way. Wait a little longer to find that out, I'm still deciding weather to write this story as a comic or a fanfic.