 Not yet the internationally popular electronic music composer he was later to become, Isao Tomita contributed the original Japanese score.However, for the American edition, songs were composed by Milton and Anne Delugg, who had provided the song "Hooray for Santy Claus" for "Santa Claus Conquers the Martians" (1964).In one of his earliest animation jobs, a young Hayao Miyazaki worked on this film as an in-between artist.