MYSTERIOUS ISLAND (1950) - colorized

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.[1][2]
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.

The castaways soon encounter a group of people that include the local natives (who worship the island's volcano), Rulu (a woman from Mercury trying to extract an unnamed superexplosive element in order to conquer the Earth), Ayrton (a wild man exiled on the island) and Captain Shard (a ruthless pirate). A mystery man, who possesses great scientific powers, also makes his presence known to the group of people; he is Captain Nemo, who survived the whirlpool in 20,000 Leagues Under the Sea, and unlike the character in the Disney film, was not fatally wounded by military troops from warships. On the way, our quintet of heroes must battle the elements and peoples while trying to figure out a way off the island and back to civilization.
Cast

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 Spillett
Leonard Penn as Captain Nemo
Terry Frost as Ayrton - The Wild Man
Rusty Wescoatt as Moley
Bernard Hamilton as Neb (as Bernard Hamilton)
Stanley Blystone as Confederate Officer (uncredited)
Tom Tyler as Union Rider (uncredited)