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Mighty Mouse is an American animated anthropomorphic superhero mouse character created by the Terrytoons studio for 20th Century Fox. The character made its first appearance in 1942 (originally named Super Mouse), and subsequently appeared in 80 theatrical films produced between 1942 and 1961. These films later appeared on American television from 1955 through 1967 on the CBS television network on Saturday mornings. The character went through two later revivals, once by Filmation Studios in 1979, and again in 1987 at the hands of animation director Ralph Bakshi, who had worked at the Terrytoons studio during his early career.

Mighty Mouse has also appeared in comics, in a television commercial about cheese, and has graced the front of a major musician's guitar. The name Mighty Mouse caused an accusation of trademark infringement to be leveled at Apple, and the character was even accused of promoting cocaine use.

The character was originally conceived by story man Izzy Klein as a super-powered housefly named Super Fly. Created as a parody of Superman, he first appeared in 1942 in a theatrical animated short titled The Mouse of Tomorrow. The original name of the character was Super Mouse, but after 7 films produced during 1942 to 1943, it was changed to Mighty Mouse in the 1944 cartoon The Wreck of the Hesperus when Paul Terry learned that another character named Super Mouse was being published in comic books. Super Mouse appeared briefly in the Marvel Comics interpretation of the character and was nicknamed Terry the First, as he was the first version of the character.

Beginning in 1945, Some Mighty Mouse episodes had musical opera like dialogue, and he was drawn slightly different. Both changes were an attempt to harken to the growing popularity of singer/ actor Mario Lanza. The first episode like this was "Mighty Mouse and The Pirates". Others included "Gypsy Life", "The Crackpot King", and others. As time went on, many Mighty Mouse adventures were focused Pearl Pureheart and Oilcan Harry. These episodes were always sung by all the characters including Mighty Mouse himself.

Oil Can Harry has not been a contender in any CBUB matches.