The Navigator begins in 14th century England , where the dreaded Black Death is wiping out cities all over Europe. A group of desperate villagers, led by the mystic visions of a young boy, set off to a remote cave where they hope they'll find the answer to escape this deadly plague. The villagers tunnel through the cave to emerge suddenly in a bustling 20th century city. These time travelers from the Middle Ages are overwhelmed by the dazzling technology of the modern world, encountering automobiles on super-highways, television and even a nuclear submarine. Somehow, they must survive the perils of this alien world in order to return home and save their medieval village from certain death.