Crainiacs

The Craniacs are a series of robot drawings that are obsessed with collecting futuristic devices, and dwell in Futuredome, a place where terrible future ideas go. Whenever a new Craniac appears, the last version is deemed "obsolete," then shuts it down and puts it into a freezing tube, to keep it into a frozen state. The versions are Craniac 1, Craniac 2, Craniac 3, and Craniac 4 (who was drawn by Rudy to shut down Craniac 3). Craniacs 1, 2 and 3 are now shunt down & put in freezing tubes. Craniac 4 became a ally with Skrawl in the episode "Double Trouble."