Feature version of the 1938 film serial FLASH GORDON'S TRIP TO MARS. Flash Gordon fights Ming the Merciless once again to ensure the survival of the Earth.

Someone is adding beef to Rocky Brown's herds and changing the brands to make it look like he is rustling. Then he is framed for murder and jailed. Johnny Argyle who has been sent to investigate believes he is innocent and sets out to prove it and starts with hides that have been rebranded.

Idaho, returning to the area he left as a boy, gets in the middle of a range feud. He takes the side of Endicott. On the other side is Hollister who is unaware that Idaho is his long lost son.

Madcap society girl June Bolton has a talent for trouble. Trying to evade a subpoena in connection with one of her misadventures, she winds up in jail and has to be bailed out by the family attorney, Dick Clayton. But June is soon in trouble again, this time involved with a mob boss and a shady lady. Exasperated by his wealthy client's reckless escapades, Clayton determines to quit... until he realizes he has fallen in love with the little madcap.

Dorothy, and her big city lawyer boyfriend, return to the Lazy 'B' ranch to read her late father's will. For Dorothy to inherit everything, she must stay on the ranch for 5 years. If she does not, everything goes to Buck, who is the manager. She does not like Buck, so she makes a deal with the wrong people for cattle and then the outlaws go to the ranch to get the $10,000 from her. But Buck is on the job.

A man has died leaving a fortune somewhere on his ranch. Brandon and his cohorts think a map is hidden in a picture frame. But when they bid on the picture at the auction, newcomer Jerry Lane outbids them. He also buys the ranch so they place their housekeeper there to get the picture. And then to keep Jerry out of the way, they frame him for murder.

Feature version of the 1936 serial starring Bela Lugosi. A European importing firm resorts to devious extremes to run its Chinese competition out of business.

A madman sets out to destroy a group of Chinatown merchants.

Fighter "Scotty" McQuade, contender for the light-heavyweight championship of the Pacific Coast,after being duped by his manager Ted Todd and fight-promoter Lew Slater, is disgusted with the fight game and decides to go back to punching cattle. He gets a job on the ranch owned by Colonel Hayden, where he once again encounters Slater, who has a crooked deal going that will cause Hayden to lose his ranch. With the aid of the Colonel's daughter, Betty Rose, and his pal "Frozen-Face" Cohen, McQuade breaks jail on a framed charge and puts an end to Slater's crooked dealings.

A gold-digging woman wins a big settlement against an older married man, which threatens to destroy the man's family. His son, discovering that the woman is part of a ring of blackmailers and that she is planning to flee the country, takes along his hulking chauffeur and follows her onto an ocean liner. There the two pretend to be a pair of wealthy playboys so that the woman will make a play for him and try to blackmail him, too, so he can then expose her and prove his father's innocence. Complications ensue.

When a deadly Nitron ray strikes Earth, Flash Gordon and his friends travel to Mars to battle Ming the Merciless and his new ally Queen Azura.

Mary Brooks' father, who has been studying ancient tribes, falls into the hands of "the people of Zar, god of the Emerald Fingers." Tarzan helps Mary locate her father, rescues everyone from the High Priest of Zar, and takes Mary to his cave.