IT CAME FROM THE SEA - - huge, hairy, glowing, terrifying. On the beach, people gathered to stare - from a distance - at a creature unlike any they had ever seen. David, a young scientist, and his girlfriend, Joan, were among them. But David was not content with a distant look. At sundown, when the crowd had gone, David and Joan returned. And that's when it happened. A blinding light was all they remembered. Suddenly David and Joan were plunged through time into a world of towering glaciers and prehistoric beings - into an adventure of cataclysmic terror from which there seemed no escape!