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.
Doug McClure
as Bowen Tyler
John McEnery
as Captain Von Schoenvorts
Susan Penhaligon
as Lisa Clayton
Keith Barron
as Bradley
Anthony Ainley
as Dietz
Godfrey James
as Borg
Bobby Parr
as Ahm
Declan Mulholland
as Olson
Colin Farrell
as Whiteley
Ben Howard
as Benson
Roy Holder
as Plesser
Andrew McCulloch
as Sinclair
