Universal's music director, Joseph Gershenson, reused the music scores from Cittadino dello spazio (1955) and Destinazione Terra (1953) in this picture's music score, much to the chagrin of the original uncredited composers Hans J. Salter, Herman Stein, Henry Mancini, and Irving Gertz.
By 1961, they were all out of their old 1950s Universal Studios contracts, and only heard about this when they got notices in the mail from the Musicians' Union. They would have appreciated checks in the mail even more, but there were none, since their old contracts considered all their studio work as 'works for hire' and this precluded them from getting any further royalties from their work. Universal continued this practice until a lawsuit from the Musicians' Union stopped it in 1966.