When an explosive battle with Dr. Eggman shatters the universe, Sonic and Gwen races through parallel dimensions to reconnect with their friends and save the world.

In the mist of 'The Robot War', Sonic comes across a strange fox with even stranger abilities. He doesn't know what he got himself involved with, but he made him a promise. A promise he intends to keep. or; Tails is a kitsune and Sonic just happens to find him. Now Sonic makes it his mission to care for him no matter what anyone says and also stop a whole war in the meantime.

The monsters are real. They roam this land. They terrorize the citizens. No one knows where they came from or how to stop them. That's what (Y/n) is for. She's immune to all the kinds of magic and possessive spells the monsters possess, and she wants to use that power to find a way to drive them out and save Mobius because the people who would have done that are gone. But she knows where they are. Sonic the Hedgehog. Shadow the Hedgehog. Silver the Hedgehog. All of them disappeared when the monsters arrived. Who was going to save them? Without them, the world suffered and surrendered to fear quickly. But (Y/n) has located the missing heroes and plans to pay them a visit. Boy, is she in for a wild ride.

After Doctor Eggman's latest attempt at controlling Sonic's world, it left the planet in disrepair and disease. What's left of the population is scared and hostile to outsiders, and they don't believe in heroes anymore. Sonic can't help them believe. He hardly believes, himself. Suffering injuries and a near defeat, he spent the last year of the apocalypse recovering with Tails, unable to communicate with his other allies. But then comes the word of three cities. Uninfected, where the world might recover from Eggman's blight. These cities might be what Sonic and Tails need to manufacture a cure and save their beloved planet. Only problem? They'll have to fight through a world of infected and hostile Mobians to get to them.

After the defeat of the Eggman Empire, what's left of the Resistance is cleaning up. (Y/n) left to go help others around the planet and Sonic went his own way. However, when familiar enemies start making appearances, the two heroes have to reunite, though challenges face them at every corner. It really is survival of the fittest, isn't it? A/n: This is based off Sonic Forces.

(Y/n) the (A/t) is a notorious criminal. Usually, Sonic the Hedgehog is busy with the infamous Doctor Eggman, but when he's not, he's hunting her. However, when the mad doctor develops a new weapon that weakens Sonic, (Y/n) saves him from a close call, taking him to the place where the criminals like her dwell. Still suffering from the effects of the weapon, Sonic has no choice but to learn how to survive in a darker world with (Y/n) as his guide.