The Turtles discover the secret headquarters of the alien invaders, and as they take on the Kraang, they'll also face off against new enemies and old - including the Rat King, Cockroach Terminator and Baxter Stockman, who seeks revenge once and for all.
Episodes Comprise: 14. I, Monster
15. The Alien Agenda
16. The Pulverizer
17. TCRI
18. Cockroach Terminator
19. Baxter's Gambit
20. Enemy of My Enemy
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