Baxter Stockman is a scientist who opposes the Turtles. This led him to get involved with the Shredder. Due to constant failures from Stockman, Shredder punished him by releasing mutagen onto Stockman, which crossed with the DNA of a fly, creating Stockman-Fly. When the Turtles stormed Super Shredder's secret mansion, Michelangelo threw a retro-mutagen bomb at him, reverting him back to a human again.
- 105. I Think His Name is Baxter Stockman (as Stockman)
- 111. Mousers Attack! (as Baxter)
- 116. The Pulverizer (as Stockman)
- 119. Baxter's Gambit (as Stockman)
- 205. Mikey Gets Shellacne (as Stockman)
- 216. The Lonely Mutation of Baxter Stockman (as Stockman and Stockman-Fly)
- 417. The Insecta Trifecta (as Stockman-Fly)
- 420. The Super Shredder (as Stockman-Fly)
- 425. Requiem (as Stockman-Fly)
- 426. Owari (as Stockman-Fly and Stockman)
Total appearances: 10.