Explorers find prehistoric monsters hidden on Unknown Island. From King Kong (1933) to The Lost World (1960), prehistoric creatures including dinosaurs were popular throughout the era. Richard Denning plays the ex-marine. Philip Reed plays the determined photographer and Virginia Grey is his fiancé. The screenplay by Robert T. Shannon and Jack Harvey is based on Robert T. Shannon's story. Directed by Jack Bernhard and produced by Albert Jay Cohen. Click for other version of poster