Mighty Mouse First Appears in "The Mouse of Tomorrow"

Mighty Mouse was created by story man Izzy Klein as a super-powered housefly named "Superfly." Studio head Paul Terry changed the character into a toon mouse instead.

Originally created as a parody of Superman, he first appeared in 1942 in a theatrical animated short entitled The Mouse of Tomorrow. The original name of the character was Super Mouse, but it was soon changed to Mighty Mouse when Paul Terry learned that another character with the same name was being published in comic books. Super Mouse appeared briefly in the Marvel comic book interpretation of the character, and was nicknamed "Terry the First", as he was the first version of the character.