The Mad Doctor, named Dr. XXX within the cartoon, is an evil scientist from the world of Disney, a parody of the popular mad-scientist archetype. He is the main villain of the 1933 Mickey Mouse animated short "The Mad Doctor". He wants to attach Pluto's head to the body of a chicken in order to "find out if the end result will bark or crow or cackle." He was voiced by Billy Bletcher in the original cartoon. He was also an antagonist in the Epic Mickey video games, but later redeems himself.