The Whale-Fly was one of the mutants genetically altered by Dr. M that consisted of a cross between dragonfly and whale. Many believe it was Dr. M's largest creature he had created, however the first hybrid you encounter could arguably be larger than the Whale Fly. Dr. M installed a device in which he would be able to monitor the mutant's actions through interface. The mutant was deployed against Sly during his efforts to retrieve his cane from Dr. M. within Kaine Island. It was equipped with sinkers which could be destroyed with Sly's biplane missle launcher. It was also equipped with a green energy emitter that could fire in a DNA like pattern or, in a complex pattern. The energy emitter attack could only be avoided by flying in the center of it.