A gang of criminals, which includes a piano player and an imposing former convict known as 'Gruesome', has found out about a scientist's secret formula for a gas that temporarily paralyzes anyone who breathes it. When Gruesome accidentally inhales some of the gas and passes out, the police think he is dead and take him to the morgue, where he later revives and escapes. This puzzling incident attracts the interest of Dick Tracy, and when the criminals later use the gas to rob a bank, Tracy realizes that he must devote his entire attention to stopping them.

Knowing the railroad is coming, Carter is after the rancher's land. Bob and Chito return just in time to save Banker Stockton and his money from Carter's men. When Stockton then lends the ranchers money, Carter has them burned out. Bob knows Carter is responsible and when Carter's henchman Saunders is recognized, Bob goes into action.

In Australia, five children pursue horse thieves through the mountains.

Two ex-soldiers return from overseas--one of them having smuggled into the country a French orphan girl he has become attached to. They wind up running into their old sergeant--who hates them--and getting involved with a race-car builder who's trying to find backers for a new midget racer he's building.

An expedition into the deep jungle discovers a native tribe led by a tall Caucasian blonde woman.

Gridley is mining silver from an old Mexican mine and bringing it into the USA thru a passage into his worthless mine. Border guard Rogers suspects Gridley and finally finds the secret entrance to the Mexican mine. He sends Lee Madison for help only to have her captured by Gridley. Trigger brings help that takes care of Gridley's men and now Roy has to rescue Madison.

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 to health against the advice of others. The handsome Evans quickly attracts the affections of their beautiful daughter, Penelope. He develops an affection for the family and their faith, but his troubled past follows him.

A criminal mastermind known as The Crimson Ghost is out to steal a device called the Cyclotrode, which can short-circuit all electrical current on the planet.

Robin Hood's swashbuckling son comes to the rescue when England's boy-king is captured by the evil, power-hungry William of Pembroke.

A tribe devoted to the leopard cult is dedicated to preventing civilization from moving further into Africa.

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 (Virginia Grey) who's nursed him back to health after a serious accident. She owns a large piece of the swamp and has outlawed hunting on her property. His rival Mike (Crabbe) is a trapper who harbors deep resentment for Johnny and his new wealthy friends. When he feels Johnny is responsible for the hunting ban, he resorts to destructive acts of vengeance.

The (O)ffice of (S)trategic (S)ervices' Cmdr. Brady (Patric Knowles) forms Operation "Applejack" (based on a composite of actual incidents during WWII) and sends Lt. (j.g.) Philip Masson, U.S.N.R. aka John Martin as spy Philippe Martine (Alan Ladd) along with Miss Ellen Rogers posing as her college roommate, Madame Elaine Duprez (Geraldine Fitzgerald) and Robert Bouchet, Tech Sgt., A.U.S. as Albert Bernardito (Richard Benedict) to acquire secret Nazi plans. After nearly getting caught they succeed and get new identities. However they discover a secret that could change the war and risk their lives to get the information back to London before it jeopardizes their lives.

A movie serial in 13 chapters, and Lionel Atwill's final film: Following the end of WWII, war-monger Sir Eric Hazarias sets the wheel in motion for WWIII. His search for Meteorium 245, the only practical defence against the atomic bomb, leads him to mythical Pendrang. Obstructing his sinister plan to rule the world are Rod Stanton, United Peace Foundation investigator, Tal Shan , Pendrang native, and Marjorie Elmore, daughter of scientist Dr. Elmore, unwilling assistant to Sir Eric.

When the unscrupulous Carlos Manning discovers that an old Spanish land grant recently unearthed will leave a huge section of California real estate to the heirs of Don Quantero, he employs Mel Donovan and his killer henchmen to murder them all. That will leave Manning as the sole heir to millions. However, Delores Quantero tumbles to this plot and enlists the aide of two-fisted reporter, Cliff Roberts to save all her relatives

Heading west for his health, Colonel Lambeth takes his daughter Rill along. Lost on the desert they are saved by Pecos and Chito. The Colonel hires the two and the Lambeths soon find themselves mixed up in Pecos' trouble. Pecos has killed Sawtelle's brother and Sawtelle as head of the vigilantes is after him.

A young boy tries to train Thunderhead, a beautiful white colt and the son of his beloved Flicka, to be a champion race horse.

The Topeka Terror is a western film of 1945 directed by Howard Bretherton. The land-rush opening of the Cherokee Strip brings in its wake a scattering of outlaws and claim jumpers. Among these is a crooked promoter. Trent Parker (Frank Jacquet), and his henchmen who plan a huge swindle by compiling falsified reports, putting the claims of honest settlers into the names of various henchmen. Clay Stevens (Allan Lane), a government agent posing as a drifting cowhand, advises the settlers to organize their resistance. Ben Jode (Roy Barcroft), the gang leader, runs for sheriff so he can gain full control of the town.

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 and return to Mars, he will be able to start a full-scale invasion of Earth. Good thing Craig Foster sets out to thwart the Monster's mission!

The spirit of an executed murderer enters the body of a physician, and forces him to do its bidding--namely, murder.

With the ending of the Spanish Civil War, a dispirited band of volunteers from the International Brigades seeks refuge in France. But on reaching the frontier, the band is disarmed, and all are detained as political prisoners. Then come instructions from Vichy that all fit prisoners are to be sent to Morocco to work on the Sahara railway for the Germans. However, one man manages to escape to London with vital information for the Allies.

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 queen of the women asks Tarzan to help them.

A desert pickpocket, his sidekick, and an escaped slave help an incognito queen in danger.

A group of men parachute into Japanese-occupied Burma with a dangerous and important mission: to locate and blow up a radar station. They accomplish this well enough, but when they try to rendezvous at an old air-strip to be taken back to their base, they find Japanese waiting for them, and they must make a long, difficult walk back through enemy-occupied jungle.