Brain is one of the main characters from the animated television series Inspector Gadget, and as such, the protagonist of Inspector Gadget Saves Christmas. Brain is Penny's dog and best friend. He is the only one who knows that Penny is the one who really saves the world and usually has the job of keeping Gadget safe on his missions while Penny investigates M.A.D's crimes. He usually disguises himself when following Gadget, which often causes Gadget to think he's a M.A.D Agent.
Appearances in Christmas specials
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