James and Katie Falcon are astonished when a Time Ship appears in the cellar with their long-deceased ancestor Captain Horatio Falcon at the helm. The Ship includes a fresh food supply of two cows. Pandemonium breaks out when Great-Aunt Dorothea is faced with a cow in her lounge. The spooked second cow stumbles into the Time Ships controls, despatching the Ship into the past at Lost Island. But it is swarming with bloodthirsty treasure-seeking pirates and the crews odds of survival appear impossible. Then the youngsters discover the Time Ships mysterious source of power and the odds of their survival and their future change spectacularly.