Shredder, Krang, Bebop & Rocksteady, Baxter Stockman, and their legions of Foot soldiers repeatedly try to destroy the Turtles and take over the world. Much of their quest for world domination hinges on repowering Krang's mobile fortress, the Technodrome, and bringing it to the Earth's surface, as it was either buried deep under New York City (season 1), stuck in Dimension X (seasons 2 and 4), embedded in the Earth's core (season 3), stranded in the Arctic (season 5), or at the bottom of the Arctic Ocean (seasons 6 and 7). However, their plans always fail, often landing the villains in humorous predicaments. Some episodes feature other minor villains, such as the Rat King, Leatherhead, Slash, General Traag and Granitor, and many others, or involve the TMNT getting themselves and the city out of a mess that they had inadvertently caused.