
Rouge the Bat: Rouge challenges Sonic, but it is later revealed it was a fake created by Metal Sonic.The player cannot use Metal Sonic, however, but plans for him to be playable was a beta element. Metal Sonic: Metal Sonic brought Sonic into this world in an evil plot to destroy him.Miles "Tails" Prower: Tails assists Sonic in escaping the grey world, and tells helpful tips to the player.Sally Acorn: Sally is the beautiful princess acorn and she's with Sonic's love intrested.Super Sonic has a Spin Dash, a Boost, and a Homing Attack. Super Sonic: Super Sonic is actually Sonic once he is using the positive energy of the Chaos Emeralds.Classic Sonic has a Spin Dash and a Stomp, while Modern Sonic has a Boost, a Homing Attack, a Drift, and a Slide.

Sonic the Hedgehog: Sonic is the playable character, who is gifted with extreme speeds and tall jumps.The robot is defeated, and the three Sonic go back to their own worlds. It is revealed that an unknown villain has brought them to this world, and that they must get back to their own world. The three Sonics collects the Chaos Emeralds from the bosses, then sees the mastermind of this plot, Metal Sonic. Metal uses the negative energy of the emeralds to transform into a super form, and the two Sonics follow him as Super Sonic. Meanwhile, the modern Sonic with Tails help eggman evil plan, and black hole sucks them into the same grey world.

Meanwhile, Classic Sonic runs though Station Square, older then when he was in Sonic Generations, and suddenly a black hole sucks everything into a land of grey. Some noises are heard as a red eye glows in the room.
