Allan Karlsson, the protagonist of the movie, is a former explosives expert who has lived an unconventional life, having participated in some of the major political events of the 20th century. Despite his age, he retains his sharp wit and curiosity about the world.
After escaping the nursing home, Allan finds himself embroiled in a series of misadventures that take him across Sweden and beyond. He befriends a petty criminal named Julius, steals a suitcase full of cash from a gangster, and unwittingly becomes a fugitive from the authorities.
Along the way, Allan reminisces about his past experiences, which include working on the Manhattan Project, meeting Presidents Truman and Stalin, and befriending a British spy named Winston Churchill. These flashbacks are interspersed throughout the movie, providing context for Allan's colorful life.
Despite the chaos surrounding him, Allan maintains a calm demeanor and optimistic outlook, embracing new experiences and the unexpected twists and turns of his journey. The 100 Year-Old Man Who Climbed Out the Window and Disappeared is a heartwarming and humorous tale of adventure, friendship, and the joys of living life to the fullest.