Donatello's newest invention, the "Dream-o-Vision" helmet, causes Michelangelo and Leonardo to be stuck in a nightmare world & the lair is being terrorized by a Freddy Krueger-like person.

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.