Brain (Inspector Gadget)
Inspector Gadget's and Penny's pet dog and companion. He is bipedal and intelligent, in the same way as a human. He assists Penny in keeping Gadget out of danger and solving crime. Brain uses a variety of disguises which always fool Gadget, although Gadget usually mistakes him for a M.A.D. agent. Brain's collar is outfitted with a retractable video communications system linked to a computer wristwatch Penny wears that allows her to relay information on Gadget's activity or warn Brain as to the whereabouts of M.A.D. agents. Brain can communicate with humans through a gruff, Scooby-Doo-like "dog" voice or pantomime and physical gestures .