President Bishop enlists the help of the Turtles when he is attacked by monsters he helped create in his past life. The "brain" behind the attacks is revealed to be Baxter Stockman who seeks revenge for Bishop's actions fifty years prior.
When President Bishop is attacked by mysterious underground monsters, he enlists the help of the Teenage Mutant Ninja Turtles. Our fearless green guardians must rescue Bishop before he loses his head (literally!) to a sinister figure from the Turtles' past... Baxter Stockman!—Anonymous