After when the Shredder is defeated by the turtles and their Sensei Splinter, both Mario brothers, Sonic, Knuckles and Tails had team the TMNT and help them to fight hostile mutants and befriending the friendly mutants in Manhattan, until then a new threat arrives known as Ch’rell the evil Utrom who must be Krang’s predecessor and as for Bowser and Robotnik they team up with him.
