It is 1865 and Union prisoners use a military balloon to escape a Southern prison camp near the end of the Civil War. The balloon drifts for days and finally lands on a mysterious volcanic island with very unusual inhabitants. Also landing, in a better aircraft, is Rulu, a visitor from Mercury. She seeks a radio-active material that will enable her to manufacture an explosive that will destroy the world or, at least, the portion known as Earth in this 15 Chapter Serial from the 1950s.
Richard Crane
as Capt. Cyrus Harding
Marshall Reed
as Jack Pencroft
Karen Randle
as Rulu of Mercury
Ralph Hodges
as Herbert 'Bert' Brown
Gene Roth
as Pirate Capt. Shard
Hugh Prosser
as Gideon Spillet
Leonard Penn
as Capt. Nemo
Terry Frost
as Ayrton - The Wild Man
Rusty Wescoatt
as Moley - Shard Henchman
Bernie Hamilton
as Neb
William Fawcett
as Mr. Jackson
George Robotham
as Mercurian
