Mastermind Baxter Fly

After promising and failing Shredder time and again to deliver a mutant army to take down the Turtles, Shredder decides he's had enough and changes scientist Baxter Stockman into a mutant man-fly.  Realizing the Turtles have developed retro-mutagen that can transform him back into a human, Baxter hunts them down. 

The Turtles better have more than a swatter to take down this mutant pest! Not only does Mastermind Baxter Fly possess super mutant strength and the ability to fly, he can also fire highly toxic acid vomit.