It's nonstop ninja action as the Teenage Mutant Ninja Turtles face off against new enemies and old, including the Rat King, Cockroach, Baxter Stockman, and more! All this, leading to the ultimate showdown against the Kraang and the Shredder himself!
Casey Jones steps up and takes on pure evil. Meanwhile, the Turtles learn a shocking secret about April's past, and come face-to-face with another mutant turtle called Slash, a fungus mutant spreading through the sewers, a rewired Metalhead, and the Rat King!