Flyborgs

The flyborg is a breed of cyborg mutant fly created by Baxter Stockman. He introduced the prototype to Krang as his "side-project", a devoted laborer whose efficiency far exceeds that of Krang's current workers. The prototype was taken for a disastrous test run, in which it attacked the rock soldiers while showing signs of sentience. It was eventually found to be a ploy to allow Stockman to steal valuable schematics from Krang.

During his stay on Burnow Island, Stockman began producing many other flyborgs for his future use, though they were presumably abandoned when Burnow Island became uninhabitable for human life.

However, he soon created a new batch of flyborg drones, which he used to impress Shredder into forming an alliance with him. Using a cerebral control unit, Stockman directed his flyborgs to kill Splinter, sending them to the Turtles' home. However, the flyborgs were all destroyed by Foot ninja before they could fulfill their mission.

During the Triceraton invasion, it was revealed that Stockman also had engineered flyborgs that were the size of an ordinary fly, which could be used for surveillance and tracking.