Archie Comics
Since the first issues of the Teenage Mutant Ninja Turtles Adventures Archie Comics follow the 1987 cartoon, the first stories are almost identical (from "Turtle Tracks" until "The Incredible Shrinking Turtles"). He is never mutated into a fly, and after the first issues he is only seen in a short flackback in the Future Shark trilogy.
Read more about this topic: Baxter Stockman