The Shredder kidnaps Splinter in an attempt to lure the Turtles to his own cause. In order to rescue Splinter, the Turtles must enter the Shredder's mobile fortress, The Technodrome and brave it's dangerous weaponry. Even if they can, they must still confront The Shredder himself, who is armed not only with the nature of their origin, but also with his own mutated henchmen, Bebop, and Rocksteady. (thetvdb.com)