Frank Spencer is well-meaning, enthusiastic, and a one-man disaster area. His search for work leads him to become a wholesale ironmongery salesman.

Frank and Betty spend a weekend with her brother George Fisher, who is about to show off his gadget-filled, fool-proof home, but George soon comes to regret having them over.

Everyday tasks like crossing the road and phoning the doctor seem easy enough, but not for Frank.

To make up for a disastrous first honeymoon, Frank and Betty are off to the seaside, and all seems to be going well until they reach the hotel.

Frank struggles to look after himself while Betty is in the hospital. However, the fun really starts when he visits Betty.

Convinced he is a failure, a depressed Frank visits a psychiatrist, but by the time Frank has related his life story, his shrink can only agree with his analysis.