In 1943, RKO created the character Krazy Mouse and produced in the Whistletoons series. Krazy's first cartoon "Legend" was released on December 1943. The character was similar to Krazy Kat and Mighty Mouse. In 1949, Krazy Mouse won its own series. The series was lasted until 1958. Krazy's first cartoon was in black-and-white. The rest are in Technicolor.