During the US Civil War, Union POWs escape in a balloon and end up stranded on a South Pacific island, inhabited by giant plants and animals. They must use their ingenuity to survive the dangers, and to devise a way to return home. Sequel to '20,000 Leagues Under the Sea' .

During the American Civil War, five northern POWs make the decision to escape the war by hijacking a hot air balloon. Drifting through the night, they wake to find themselves marooned on a desert island, but they aren't alone.