Hughie Mack, a not so nice western singer, is discovered by Clover Doyle as the next movie cowboy hero. His name is changed to Slim Carter and a promotional buildup begins. Leo Gallaher, an orphan boy wins the contest to spend a month with Slim. Leo is a good influence on his cowboy hero. Clover sees the good and more in Slim. Montana Burriss is Slim's double.

George Nader plays a reporter whose career is ruined by liquor. A comeback opportunity presents itself when Nader is a bystander at the arrest of a well-known criminal.

A college paleontology professor acquires a newly discovered specimen of a coelacanth, but while examining it, he is accidentally exposed to its blood, and finds himself periodically turning into a murderous Neanderthal man.

After robbing a bank Murphy assumes the identity of his pursuer, a famous US Marshal, when he stumbles into a town and is confronted by the local judge, Matthau. Murphy is forced to remain as the new Marshal; an old flame, Scala, nearly unmasks him by accident, only to be forced to assume the ruse of being Murphy's wife. The "couple" given a house and respectability, which neither has had before. They maintain the charade to avoid hurting a young orphan boy, Matthau's ward. Scala is torn by her loyalty to boyfriend planning to rob the bank and growing feelings for Murphy