It's the energy vampire, Nos 4-A-2, from Buzz Lightyear of Star Command. He drains robots of their energy and can also turn an innocent robot into an energy vampire. But organic beings suffer a different kind of side effect when they've been bitten by Nos 4-A-2. When exposed to radiation, the bitten organic being will turn into a Wirewolf, which is a robotic werewolf that sucks energy from other robots, but does it a little more violently and more messy.