Dumbo is a 1941 American animated film produced by Walt Disney Productions and premiered on October 23, 1941, by RKO Radio Pictures. Sound was recorded conventionally using the RCA System. One voice was synthesized using the Sonovox system, but it, too, was recorded using the RCA System. Dumbo, the fourth animated feature in the Walt Disney Animated Classics series, is based upon the storyline written by Helen Aberson and illustrated by Harold Pearl for the prototype of a novelty toy ("Roll-a-Book"). The main character is Jumbo Jr., a semi-anthropomorphic elephant who is cruelly nicknamed "Dumbo". He is ridiculed for his big ears, but in fact he is capable of flying by using his ears as wings. Throughout most of the film, his only true friend, aside from his mother, is the mouse, Timothy – a relationship parodying the stereotypical animosity between mice and elephants.