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' .

• Ameran Films
• Columbia Pictures
• Michael Craig
• Joan Greenwood
• Michael Callan
• Gary Merrill
• Herbert Lom
• Beth Rogan
• Percy Herbert
• Dan Jackson