Teenage Mutant Ninja Turtles (2003)

Season 7: Back to the Sewer

Episode 14: Mayhem from Mutant Island

During a night of showing off their extreme sports gear, the Turtles are attacked by a monster from beneath the Earth. They trace it to a remote island where they uncover their old foe, Baxter Stockman, who has created vicious monstrosities to unleash on the unsuspecting public.