The survivors of a sunken ship, including a shipbuilder's son and an experienced captain, take control of the U-Boat and find themselves stranded on a mysterious island where different eras of Earth's evolution coexist, featuring various human species and prehistoric dinosaurs, amidst active volcanoes, posing a significant challenge to their survival.

The Land That Time Forgot
In the midst of World War I, a German U-boat's navigational mistake results in its prisoners discovering a previously unknown land, Caprona, teeming with ancient life forms and civilizations.