The Thubanian leader is the leader of the cats from Thuban 9. He uses a puppet, Professor Katz, to interact with the human upper class. He took the role of Leela's pet, Nibbler, for a few days during the Thubanian invasion. His collar is able to glow, as are his companions'. The Thubanians invaded and enslaved Earth in July of 3010.Their purpose was to steal the Earthican magnetic field, but they were eventually stopped by Amy and Nibbler.