 In all English versions of the film, the rock & roll "Great Giant Beast  Gappa" theme (heard in the opening credits and ending of the original  Japanese version) is replaced by standard orchestral music. Also, the  Japanese version features a song called "Keep Trying, Baby Gappa!" (in the  scene where the Gappas are reunited with their offspring). In all English  versions, the songs vocals are omitted, and is thus instrumental.