 Masten Thrust, a billionaire oil tycoon and big-game hunter, has announced the discovery of a lost world hidden inside the warm pocket of a dormant volcano at the north pole. Upon arriving, Thrust and his team find that the hidden world is populated with both dinosaurs and prehistoric humans. While the humans give the explorers a fair bit of trouble, the real danger is the hungry tyrannosaur intent on making lunch out of the Great White Hunter and his crew.