Sonic The Hedgehog, Miles “Tails” Prower, Knuckles The Echidna, Amy Rose, Shadow The Hedgehog, Rouge The Bat, and The Chaotix (Vector The Crocodile, Espio The Chameleon, and Charmy Bee) have been sent from their home planet (Mobius) to Planet Earth and now live in New York City. They have once again foiled the plans of their arch enemy, Doctor Ivo Robotnik. Robotnik is very angry because he can’t defeat Sonic. He then comes up with the idea to team with another evil villain from the city. He eventually finds out about evil Ninja master, Oroku Saki (Shredder) and decides to team up with him.
Deep in the Sewers of New York lives ninja master, Master Splinter, and his 4 sons (who are turtles), Leonardo, Donatello, Raphael, and Michelangelo. The turtles’ human friend, April O’Neil soon finds out about Shredder and Robotnik’s plans and tells the turtles about it. The turtles eventually run into Sonic and his friends. They tell each other about their enemies’ plans and decide to team up to take them down. Just then, a mysterious futuristic hedgehog (Silver) appears out of nowhere. Silver tells Sonic and the turtles about his future being on fire and that he came to the past to prevent that. Sonic agrees to help Silver if he helps him defeat Shredder and Robotnik.
