Dr. Jekyll believes good and evil exist in everyone and creates a potion that allows his evil side, Mr. Hyde, to come to the fore. He faces horrible consequences when he lets his dark side run amok.

The Range Busters head for Pinto Basin where a series of stage robberies have occurred. To try and find the gang's boss, Crash sends out a empty money box. The plan backfires when the boss has the Range Busters identified as the robbers. Thinking it is now safe, the bank sends out a big money shipment. Needing to rob the stage, the boss gets the boys out of jail so they can be blamed. But this is just the chance they need to catch the robbers.

Bob Adams, ace newsreel cameraman, is told by his boss, "Get the picture---we can't screen alibis." He heads for Samari, a desert hot-bed of tribal unrest in Africa, to do just that, which includes getting footage of El Kadar, bandit and rebel leader. He gets his pictures but only after a romance with the Colonel's daughter Pamela, saving his wimpy, hacked-off brother Don from being a dupe of the gun-runners, and run-ins with spies and throat-cutting tribesman. For a finale, he saves the British Army.

Hoppy's friend Dennis owns a rich gold mine. Frazier who owns the adjoining mine and wants the Dennis mine, has Dennis killed. Hoppy steps in to take over running the Dennis mine and learns Frazier's men sneak into and work the Dennis mine at night. Hoppy captures one of Frazier's men only to be captured in return by Frazier and left to die in a burning building.

Wells Fargo hires three cowboys to clean up a lawless town.

Gold stages are being held up in the far west at a time when the U.S. government needs bullion, just before the famed "Black Friday" attempt to corner the gold market.

Lorna Drake has inherited a ranch. Hoppy teaches her a bit about ranching and handles Scar Lewis, the bad guy, in the process.

Former silent screen comic Harry Langdon earned above-title billing for the final time in his long career in this roughhewn but amusing World War II farce released by Poverty Row company PRC. Langdon and Charles "Buddy" Rogers are newspaper messengers helping reporter Ray Walker obtain an interview with journalist-hating inventor Richard Kipling. But before they know it, Harry and Buddy become unwittingly involved in plans to steal the professor's newest invention: a machine gun.

The notorious outlaw Black Bart has reappeared and the Range Busters are sent to investigate. When they find that Black Bart is now a respectable citizen and that someone is impersonating him, they set a trap for the robber.

A variety of people are searching for a long-hidden treasure somewhere on an island. Chapters: 1. The Isle of Fear, 2. The Ghost Talks, 3. The Phantom Duel, 4. Buried Alive, 5. The Girl Who Vanished, 6. Trapped by the Flood, 7. The Cannon Roars, 8. The Circle of Death, 9. The Pirate's Revenge, 10. The Crash, 11. Dynamite, 12. The Bridge of Doom, 13. The Mad Flight, 14. The Jaws of Destruction, 15. Justice