A group of adventurers sets out on an expedition to find a lost city in the uncharted territories. However, they end up discovering a hidden prehistoric land filled with dangerous creatures and must fight for their lives to escape.

During World War I, an English ship is sunk by a German U-boat, leaving the survivors stranded on a hidden island filled with dinosaurs and other deadly creatures. The group must band together to fend off their enemies, navigate treacherous terrain, and uncover the secrets of the island in order to escape.