Rock'n'Roll and bananas has arrived the country, and Egon has found out about sabotage plans about a circus, in order to take it over.

In 1958, a young Egon Olsen tries to escape from the orphanage by being adopted by a rich couple - but his new "parents" are rocket scientists who want to shoot him into space.

The Gang form The Dynamites. After winning a talent competition they are told by manager Pop-Johansen that the band will be huge in the U.S. But is he only after their prize money?

On the orphanage Lykkebo, Egon sits and wants a real family - a mother and a father like Kjell has. The rich couple Gyldenløwe picks out 5 boys they consider adopting, but with a little sabotage Egon himself get picked. Suddely Egon is the rich son with a swimming pool and a big house. What Egon don't know is that Gyldenløwe has exchanged a million dollars for all the papers on Egon Olsen.

Norwegian engineers are searching for oil and Egon Olsen convinces his friends to buy stocks in the oil market. In the process, Egon, stumbles upon a scheme to fool the Norwegian Government that there is indeed no traces of oil in the North Sea. The Olsen Gang tries to tell the ministry the truth about the oil but they are caught by Sheik El-Altan who, in order to make sure the boys keep their mouths shut, kidnaps Valborg and brings her to Egypt.

The Olsen gang of Egon, Benny and Kjell are constantly looking for the big coup to become millionaires. They have laid out the perfect plan to break into the new Munch Museum in Bjørvika and steal "Scream".

A good looking female social welfare worker makes Egon Olsen forget about crimes for some time, but when an American gangster breaks into a local bank and the police think its Egon's work, he has to get back to work to prove he's innocent.

The Olsen Gang realizes that cash is obsolete with the current inflation rate, and plans a coup for property and bonds. They make a fake company and tries to buy Oslo's biggest shopping mall, Steen and Strøm.

Fifteen years after they last saw each other, Benny, Valborg and Dynamitt-Harry discovers that Egon Olsen is out of prison and living in a retirement home. Olsenbanden is reunited, and Egon has a plan.

The Olsen Gang is involved in a weapon trade for half a billion. It's their final coup, and Valborg is finally allowed to participate.