The relationship of Alex and Teresa has hit hard times. After 15 years of marriage, the passionate football coach and the sensitive psychoanalyst do not respect each other's needs anymore, and thus they are arguing constantly. Even a divorce seems possible, but then something unbelievable happens: After another ugly fight during a big thunderstorm, they switch bodies. Trapped, they have to play each other's roles, and chaos is bound to follow.
After 15 years as coach of a middle-class ice hockey team in Canada, Harry Zoppke has served his purpose. Without a job and without a family, he returns to his hometown of Freiburg. While looking for work at his old club, the EHC Freiburg, he meets Benny, whom he once coached. Benny has come a long way as a joke item manufacturer. But Benny is always plagued by the uncertainty about the identity of his father. When Benny discovers that Harry is left-handed like him and has the same allergies, he is convinced that Harry must be the long-awaited biological father. Benny, in turn, is completely taken aback and ultimately misses the right moment to explain the misunderstanding to Benny. Instead, Harry soon enjoys having a son and no longer being alone. Benny now finally has the father he always wanted.