The main and end title music heard in the overseas releases of this film (for example, Monster from a Prehistoric Planet in the U.S.) were from an earlier film also scored by Seitaro Omori, the Nikkatsu teen drama/comedy film Youth Song (1959).
This is the only giant monster film (daikaijû eiga) ever released by Nikkatsu. Unfortunately, after this film was released, the studio nearly went out of business.
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By what name was Gappa the Triphibian Monster (1967) officially released in India in English?
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