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Official Site: Disney

The Mickey Mouse universe is a fictional shared universe which is the setting for stories involving Disney cartoon characters, including Mickey and Minnie Mouse, Donald and Daisy Duck, Pluto and Goofy as the primary members (colloquially known as the "Sensational Six"), and many other characters related to them, being most of them anthropomorphic animals. The universe originated from the Mickey Mouse animated short films produced by Disney starting in 1928, although its first consistent version was created by Floyd Gottfredson in the Mickey Mouse newspaper comic strip. Real-world versions also exist in Disneyland and Tokyo Disneyland, called Mickey's Toontown.

Since 1990, the city in which Mickey lives is typically called in American comics. In modern continuity, Mouseton is often depicted as being located in the fictional U.S. state of Calisota, analogous to Northern California. This fictional state was invented by comics writer Carl Barks in 1952 as the location for Donald Duck's home city, Duckburg.

The most consistent aspect of the Mickey Mouse universe is the characters. The most well-known include Mickey's girlfriend Minnie, pet dog Pluto, friends Goofy, Horace Horsecollar, Clarabelle Cow, and nemesis Pete. Some Disney productions incorporate characters from Disney's animated feature films, such as Bath Day (1946), in which Figaro from Pinocchio appears as Minnie's cat (becoming her recurring pet in several productions), Mickey's Christmas Carol (1983), and – most extensively – House of Mouse (2001–2003).

Although crossovers between the Mickey Mouse and Donald Duck universes have been infrequent, the two universes overlap. Characters from the Donald Duck universe make occasional appearances in the Mickey Mouse universe and vice versa.

The Mad Doctor has not been a contender in any CBUB matches.