Sparky is a very intelligent monkey of unknown origin. He assists Doctor Insano around the lab by doing menial chores, fetching things, and handling maintenance on some of the Doctor's inventions.
Since Bob's incapacitation, Sparky has been assigned to looking after Bob's body. Bob is able to telepathically communicate with Sparky and give him orders via the helmet that Sparky is always wearing.
Sparky is very adept at handling nearly any gadget he can hold in his hand: from remotes to ray guns. For reasons unknown, he insists on wearing a diaper.
Sparky has witnessed many catastrophic failures in the lab, and has developed keen senses that allow him to escape danger. If you ever see this monkey run by you… follow that monkey!