The Diamond from the Sky

Four youthful cadets are implicated in a series of murders, and must attempt to clear themselves of suspicion.

Greedy traders have kidnapped a researcher, hoping he will reveal the location of a treasure in a hidden village. Family and friends of the researcher come looking for him. Adventure ensues.

Daisy Smith (Marceline Day), a floater and non-desirable citizen in most societies, seeks refuge on a tropical island in the South Seas. She meets Jim Curtis (Don Alvarado), another society-outcast and a piece of human driftwood, and a romance takes place that regenerates both and they sail back to the United States determined to start life anew.

A mechanic works for his sweetheart's father, who builds racing boats. He begs for and gets the chance to race a new-design boat, but his rival gets him intoxicated before the race and he wrecks the boat. Now he has to make good and show he has the right stuff.

A newspaperwoman finds trouble aplenty when an Inca tribe believes her to be the reincarnation of their long-lost princess.

A mad scientist named Dr. Satan plots to steal key pieces of technology to enable him to build an army of robots based on his prototype to conquer America. The only one standing in his way is Bob Wayne, who fights Satan as the enigmatic Copperhead. Mysterious Doctor Satan is a 1940 film serial named after its chief villain. Doctor Satan's main opponent is the masked mystery man, "The Copperhead", whose secret identity is Bob Wayne, a man searching for justice and revenge on Satan for the death of his step-father. The serial charts the conflict between the two as Bob Wayne pursues Doctor Satan, while the latter completes his plans for world domination.

The evil and masked "Gargoyle" is sabotaging all of America's industrial plants. It is up to the Spider to save the country.

A movie serial in 12 chapters: The famous comic strip character is on a mission to protect a secret tunnel passage between China and India.

Buffalo Bill Cody battles a gang of outlaws secretly headed by an unscrupulous lawyer.

An accomplished aviator sets out to locate treasure hidden by one of his ancestors. He encounters interference from various adversaries.