In this fantasy adventure tale based on a novel by Edgar Rice Burroughs, Ben McBride (Patrick Wayne) sets out to find Bowen Tyler (Doug McClure), a fellow explorer who was lost during an expedition to the island of Caprone, a tropical oasis in the midst of the arctic. McBride arrives at Caprone to discover that Tyler is fending off tribes of savage cavemen, doing battle with strange prehistoric beasts, and contending with frequent volcanic erruptions. Of course, life on Caprone isn't all bad, as a glimpse of Tyler's significant other Ajor (Dana Gillespie) would suggest, but the men still face many significant challenges as they try to get off the island and back to civilization. The People That Time Forgot was Doug McClure's third go-round in an Edgar Rice Burroughs adventure vehicle, following adaptations of The Land That Time Forgot and At the Earth's Core.~ Mark Deming, All Movie Guide