Baxter Stockman's/ Baxter Fly's M.O.U.S.E.R.S, who came in contact with the Super Mutagen. Super M.O.U.S.E.R.S debuts in TMNT: Danger of the Ooze.
After Baxter Fly was defeated by the Ninja Turtles, Baxter Fly took the Super Mutagen away with him. Without realizing it, some the substance fell on his M.O.U.S.E.R.S. Then the M.O.U.S.E.R.S mutated into Super M.O.U.S.E.R.S.
- They are the upgraded version of the M.O.U.S.E.R.S.
- Baxter Fly didn't realized that he mutated them.