Mysterious Island is a 1951 American 15-chapter movie serial from Columbia Pictures, the studio's 46th, that stars Richard Crane, Marshall Reed, Karen Randle, and Ralph Hodges. It is an adaptation of Jules Verne's 1874 novel, The Mysterious Island (L'Île mystérieuse). As in the original story, which was Verne's follow-up to Twenty Thousand Leagues Under the Sea, this serial is set in 1865. However, Columbia's screenwriters added alien Mercurians as an additional set of villains. The serial has been labeled a space opera version of Verne's novel.

Plot

During the siege of Richmond, Virginia, in the American Civil War, POW Capt. Cyrus Harding escapes from his Confederate captors in a rather unusual way – by hijacking an observation balloon. In his escape, Harding is accompanied by sailor Pencroft, his nephew Bert, writer Gideon, loyal soldier Neb, and a dog. A hurricane blows the balloon off course, and the group eventually crash-lands on a cliff-bound, volcanic, uncharted (and fictitious) island, located in the South Pacific, with very unusual inhabitants. They name it "Lincoln Island" in honour of American President Abraham Lincoln.