S6E11
Donatello Trashes Slash
⚠ Spoiler alert This recap gives away what happens in this episode.
Episode Summary & Review
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.