Originally, Isadore Klein, from the Terrytoons story department, wanted to spoof Superman using a fly. Paul Terry changed the fly into a mouse, resulting in this, the debut film of Super Mouse (later known as Mighty Mouse).
The character is named Mighty Mouse in the version altered for television. In the original theatrical cartoons, he was not known by that name until his eighth film, The Wreck of the Hesperus (1944).