The turtles find out where the Ooze, the substance which made them mutate, came from. Unfortunately Shredder learns about it too, and uses it to enhance himself. So the turtles have to prove again who's the better ninja fighter.
Teenage Mutant Ninja Turtles II: The Secret of the Ooze
The Turtles and the Shredder battle once again, this time for the last canister of the ooze that created the Turtles, with which Shredder wants to unleash an army of new mutants.
