At the request of the Mexican government, a federal agent and a lady reporter team up to catch a gang that has been smuggling gold from Mexico to the U.S. and then selling it to the U.S. government.

Re-edited feature version of serial The Phantom Empire (1935). Singer Gene Autry discovers a race of advanced humans living beneath the earth.

Gunner and Bucker are friends who work as riveters. Whenever Bucker gets the urge to marry, which is often, Gunner will hit on his girl to see if she is true or not. So far, Gunner hasn't failed. But one night, while Gunner is in jail, Bucker meets Mary, a tough dame with a line. He falls for her, and she falls for his money. But Mary is already a gal pal of Gunner, and no two know about the third one. The trouble starts when the triangle is revealed too late.

A reporter's marriage is jeopardized by his drinking and he finds himself accused of a murder he didn't commit.

Billy, after shooting down land baron William Donovan's henchmen for killing Billy's boss, is hunted down and captured by his friend, Sheriff Pat Garrett. He escapes and is on his way to Mexico when Garrett, recapturing him, must decide whether to bring him in or to let him go.

Two members of a crew of "sandhogs", men who work on an underwater tunnel project, battle each other over the same woman and a rival team of sandhogs to see who will finish their half of the tunnel first, with the winning team getting more money and guaranteed future work.