The Olsen Gang has to pay for their summer vacation in Spain, and Egon is hired to open a safe with black market money in Switzerland. He is conned, but Egon has sworn revenge.
Based on the television sitcom Fleksnes Fataliteter. Marve Fleksnes (Wesenlund) lives a comfortable life with his mother (Schønemann), but misses a woman in his life. He is afraid he might become the last Fleksnes. His mother enrols him in a charm school, where he excels. At the same time, a young lady moves into the apartment across the hall.
The Olsen Gang becomes millionaires. Unfortunately for the gang, their arch-enemies, the King and the Jack, are planning to steal the money for themselves.
