Mannie Davis & John Foster (1947)
The fox convinces the duck that the sky is falling, and the duck tells the hen, and both of them tell the pig, and the three of them tell the King and, the next thing anyone knows is that the whole kingdom is twatting and twittering over the upcoming catastrophe, with the exception of the one who started the rumor. But Mighty Mouse flies in, with a song on his lips, and sets matters straight.
The character was created by story man Izzy Klein as a super-powered housefly named Superfly. Studio head Paul Terry changed the character into a cartoon mouse instead (click here for the Terrytoon theatrical shorts).
Originally 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 cartoons produced in 1942-1943, it was changed in the 1944 cartoon ‘The Wreck of the Hesperus‘ 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 Comics interpretation of the character and was nicknamed Terry the First, as he was the first version of the character.

Mighty Mouse originally had a blue costume with red trunks and a red cape, like Superman, but over time this outfit changed to a yellow costume with red trunks and a red cape, his most popular colors. As with other imitations of Superman, Mighty Mouse’s super powers include flight, super strength, and invulnerability. He has demonstrated the use of X-ray vision in at least one episode, while during several cartoons he used a form of telekinesis that allowed him to command inanimate objects and turn back time. Other cartoons have him leaving a red contrail during flight which he can manipulate at will like a band of solid flexible matter.
The initial formula of each story consisted of an extended setup of a crisis which needs extraordinary help to resolve, after which Mighty Mouse appears to save the day.