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.

Andre omgang is the story of a father and his two sons trying to adjust to life's later summers; the father becomes a member of a singles' club, Sverre joins a swingers club, and Erik finds a new woman to live with. The three of them are passionate supporters of Skeid Football Club.