By the time he leaves Malmköping, his carers have informed the police of his disappearance, and Inspector Aronsson (Ralph Carlsson) is investigating, unaware of the suitcase in Allan's possession.

While fleeing the scene, Allan and Julius catch a lift from Benny, an insecure young man, and all three find their way to a smallholding where Gunilla lives with her pet elephant, Sonja.

The gangsters meet their individual deaths through misadventure, apart from Gäddan, their violent boss, who loses his memory after an accident and becomes part of the group.

Enraged, Allan's father travels to Russia after the Russian Revolution to set up his own republic and support his invention, only to be executed by firing squad.

For his work, Allan receives praise from U.S. Vice President Harry S. Truman (Kerry Shale) for 'building a bomb that will stop all wars'.

Allan returns to Sweden, but on touching down he is met by representatives of the Swedish government, seeking to make use of his knowledge of the atomic bomb.

The story continues through other countries and wild adventures, with Allan "coincidentally" meeting new people, both famous and ordinary, and causing world changing events, in a way that has been compared with Forrest Gump.

The consensus reads: "Its efforts to earn laughs can be as ungainly as its title, but for viewers in tune with its absurdist humor, The 100-Year-Old Man Who Climbed Out the Window and Disappeared offers much to recommend.