The Whale-Fly was one of the mutants genetically altered by Dr. M, consisted of a cross between dragonfly and whale. Dr. M installed a device in which he would be able to monitor the mutant's actions through an interface. The mutant was deployed against Sly Cooper during his efforts to retrieve his cane from Dr. M within Kaine Island. It was equipped with sinkers which could be destroyed with the missile launcher from Sly's biplane. It was also equipped with a green energy emitter that could fire in a DNA-like pattern or a complex pattern. The energy emitter attack could only be avoided by flying in the center of it.
Dr. M removed the creature's vocal cords at some point.