At the end of the seventh season, the Turtles sent the Technodrome through a portal into Dimension X, but without Shredder, Krang, Bebop, and Rocksteady. As a result, the villains were stranded on Earth without any weapons or power, and were forced to work out of an old science building until they can find a way back into Dimension X and retrieve the Technodrome. The Turtles, taking advantage of the situation, relentlessly pursue their arch enemies in an effort to put an end to their schemes once and for all. Eventually, Shredder and Krang, along with Bebop and Rocksteady, build a new portal into Dimension X and reclaim the Technodrome, although the Turtles manage to track them down with the help of Gargon, a mutated resident of Dimension X who was being held prisoner by Shredder and Krang. At the end of season 8, the TMNT finally banish Shredder, Krang, Bebop, and Rocksteady to Dimension X by destroying the Technodrome's engines and trans-dimensional portal, preventing them from returning to Earth.