An expedition into the interior of Papua New Guinea comes across a tribe of ape-like people who may or may not be ancestors of early man.
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Skullduggery (1970) is a adventure, sci-fi movie running 1h 45m. Starring Burt Reynolds, Susan Clark, Roger C. Carmel. Rated 4.9/10 on TMDB. Watch it online free on ZapFlix.