A pretty ranch owner hires a drunken gunslinger and his two companions to protect her ranch from outlaws and build a school for local children.

When practicing for a role, actor Jack is mistaken for the killer Ace. He doesn't realize this until it's too late and is carried off to gangster boss Leo Smooth, who wants Ace to do a job for him. Fearing for his life, Jack plays his role, but always searching for a way out of the well-guarded house.

Orphaned and left in the desert as an infant, Evil Roy Slade grew up alone—save for his teddy bear—and mean. As an adult, he is notorious for being the "meanest villain in the West"—so he's thrown for quite a loop when he falls for sweet schoolteacher Betsy Potter. There's also Nelson L. Stool, a railroad tycoon, who, along with his dimwitted nephew Clifford (Henry Gibson), is trying to get revenge on Evil Roy Slade for robbing him.

Officer Carey Mahoney and his cohorts have finally graduated from the Police Academy and are about to hit the streets on their first assignment. Question is, are they ready to do battle with a band of graffiti-tagging terrorists? Time will tell, but don't sell short this cheerful band of doltish boys in blue.