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Carl Fredricksen, a shy and quiet young boy, meets an energetic and outgoing bucktoothed barefooted tomboy named Ellie, discovering they share the same interest in exploration as their hero, the then 24-year-old famed explorer Charles F. Muntz. Ellie expresses her desire to move her clubhouse to Paradise Falls in South America, a promise she makes Carl keep. Carl and Ellie wed and grow old together in the old house where they first met while making a living as a toy balloon vendor and a zookeeper respectively. Unable to have children, they also try to save up for the trip to Paradise Falls but other financial obligations arise. Just as they seem to finally be able to take their trip, Ellie dies of old age, leaving Carl living alone in their home as a sour recluse with nothing to live for and missing his wife terribly. As the years pass, the city grows around Carl's house with construction as Carl refuses to move. After a tussle with a construction worker over Carl's broken mailbox, the court orders Carl to move into Shady Oaks Retirement Home. Carl comes up with a scheme to keep his promise to Ellie, and uses his old professional supplies to create a makeshift airship using tens of thousands of helium balloons that lift his house off its foundations. Russell, a Wilderness Explorer trying to earn his final merit badge for "Assisting the Elderly", has stowed away on the porch after being sent on a snipe hunt by Carl the day before.