Sometime after World War II, Rex Hunter, bush pilot and part-time hero for hire, has crash-landed in an unexplored jungle. With him are Professor Spector, a zoologist and famous inventor, and his assistant Mary. They find themselves in a time warp, in a world where dinosaurs and cavemen still exist. Someone has hauled off the pieces of their plane in the middle of the night. It's up to Rex to solve the mysteries of the strange land and find their missing plane so they can get back to the world they came from. To do this, Rex and his friends must brave dinosaur attacks, cross treacherous terrain, and outwit cunning traps if they want to survive.