Teenage Mutant Ninja Turtles (1987): Season 6, Episode 11

6 - 11: Donatello Trashes Slash

Slash, the evil mutant turtle, returns to Earth from outer space with a greatly increased IQ and a raygun that turns humans into turtles. He plans to reign as Turtle Supreme, but he will have to get past the Teenage Mutant Ninja Turtles to do it.