self-referential Baron Draxum — in action, part of a clip screened during the show’s San Diego Comic-Con panel on Thursday. Additional TV stars lending their voices to anti-Turtle villains ...

They have their first encounter with Baron Draxum who is making mutants with ... the Turtles have to fight a whole host of villains like the Mutant Silverfish, the Foot Clan, Hypno-Potamus ...

Check it out above. The supporting cast is even more eclectic. Expect appearances from John Cena as the evil Baron Draxum, Game of Thrones' Lena Heady as the giant spider mutant Big Mama ...