A ship sent to investigate a wave of mysterious sinkings encounters the advanced submarine, the Nautilus, commanded by Captain Nemo.

While executing an armored car heist in Los Angeles, icy crook Dave Purvis shoots policeman Lt. Phillips before he and his cronies make off with the loot. Thinking he got away scot-free, Purvis collects his money-crazy mistress, Yvonne, then disposes of his partners and heads out of town. What Purvis doesn't know is that Phillips' partner, tough-as-nails Lt. Cordell, is wise to the criminal's plans and is closing in on his prey.

A tough cop meets his match when he has to guard a gangster's widow on a train journey from Chicago to Los Angeles.

When newlyweds visit Las Vegas, the wife's shady past comes to the surface.

Secret Service agents make a deal with a counterfeiting inmate to be released on early parole if he will help them recover some bogus moneymaking plates, but he plans to double-cross them.

Secret Service agents make a deal with a counterfeiting inmate to be released on early parole if he will help them recover some bogus moneymaking plates, but he plans to double-cross them.

A lawyer who is planning to run for District Attorney accidentally kills a gangster who owns the nightclub where the attorney's girlfriend is a singer. Although he manages to cover up his involvement in the crime, his girlfriend discovers the body and is subsequently charged with the murder.

American arms dealer Kennedy hopes to make a killing by selling to the "regulares" in the 1916 Mexican revolution. American mercenary Wilson favors the rebel faction headed by Escobar, and they plot to hijack Kennedy's arms; but Wilson also has his eye on Kennedy's wife. Raids, counter-raids, and escapes follow in a veritable hail of bullets.

Bad guys plot to trick a newly arrived Eastern girl out of a ranch which belongs to her infant ward. Roy, of course, saves the ranch for the girl. Songs include "I'm Headin's for the Home Corral," "He's a No Good Son of a Gun," "Sandman Lullaby," "Song of the San Joaquin," and "I'm a Cowboy Rockefeller."

Lambert owns the trucking line that ships cattle to market. When he raises his rates Roy decides to ship the cattle on the River Boat. When Lambert and his men are unable to stop the boat, they rustle the cattle.