Mighty Mouse was originally conceived by Paul Terry’s Terrytoons studio for 20th Century Fox. 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 1944.
Beginning in 1945, some Mighty Mouse episodes had musical opera-like dialogue, and he was drawn slightly differently. Both changes were an attempt to hearken 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 on Pearl Pureheart and Oilcan Harry. These episodes were always sung by all the characters including Mighty Mouse himself.
Mighty Mouse had little impact as a theatrical feature, but became Terrytoons’ most popular character and a cultural icon on television. CBS purchased the Terrytoons studio from Paul Terry in 1955. The Mighty Mouse Playhouse aired on Saturday mornings from 1955 until 1967 using the existing feature film library. (Wikipedia)