During World War I, a German U-boat sinks a British ship and takes the survivors on board. After it takes a wrong turn, the submarine takes them to the unknown land of Caprona, where they find dinosaurs and neanderthals.
Stars
Doug McClure
John McEnery
Susan Penhaligon
Keith Barron
Anthony Ainley
Godfrey James
Bobby Parr
Declan Mulholland
Kevin Connor
