Son of Svengoolie

Monster from a Prehistoric Planet (1967) (1x25)

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An expedition in the South Pacific islands on a tropical island where the natives worship the mysterious deity Gappa. An earthquake opens up an underground cavern and a baby reptile is discovered inside. The natives warn the foreigners to leave the hatching alone, but they don't listen and take it back to a zoo in Japan. Soon after Momma and Pappa Gappa start smashing Tokyo looking for their kidnapped child.