Episode Title:Revenge of the Fly.Episode Description:Baxter Stockman & his alien computer return to Earth from the Dimensional Limbo & take possession of Shredder's Retro-Mutagen Ray Gun. After stealing the essences of various insects & arachnids, he uses them to turn people into mutant insects & arachnids. The Turtles must battle the creatures & turn the people back to normal.