A scientific expedition happens to discover that gold exists on Tarzan’s escarpment. The villainous Medford and Vandermeer kidnap Jane and Boy to extort from Tarzan the location of the gold.

Marshal Johnnie Taggart, posing as an outlaw named “Ace” Braddock, comes to Bannack, Montana to restore law and order. But he is recognized by Kitty, co-owner with Clay Curtwright of…

Claire Forrest seeks her kidnapped scientist father, hidden somewhere on Mystery Island. He is held and forced to work on diabolical inventions by Captain Mephisto, a costumed villain.

A group of archaeologists asks Tarzan to help them find an ancient city in a hidden valley of women. He refuses, but Boy is tricked into doing the job. The…

A Martian invader crashes his spaceship conveniently close to the workshop of a scientist who is developing an interplanetary craft. If the extraterrestrial Purple Monster can complete the rocket ship…

Superman comes to the rescue when a volcano erupts.

Jim Dorn endeavors to protect Jean McNain from a man she knows has committed a murder, Carter Snowden

Notorious shootist and womanizer Quirt Evans’ horse collapses as he passes a Quaker family’s home. Quirt has been wounded, and the kindly family takes him in to nurse him back…

Buster Crabbe and Johnny Weissmuller battle it out in Cajun country! Johnny, a riverboat pilot on the Mississippi, is seduced away from his fiance (Carol Thurston) by a rich outsider…

An expedition arrives on an uncharted jungle island to rescue the local natives, led by a jungle boy, from a volcano that is about to erupt.

Superman’s reputation is tarnished when a crook begins committing crimes in a Superman costume.

An internationally-notorious criminal scientist returns to the US to sell his latest invention, a disintegrating gas, to a foreign power. When he arrives, however, he is spotted by a young…