One day while walking home from a movie, Carl Fredricksen discovers an abandoned house and hears voices from inside. Curious, Carl enters the house and discovers Ellie, a young and feisty girl with whom he quickly falls in love. Many years later when Ellie dies, Carl is forced to live alone in the now refurbished house, which is surrounded by a huge construction site in the city. The next day, Carl is about to be picked up by Shady Oaks Retirement Home after striking a construction worker with his walker, when he reveals thousands of balloons that lift him, his house, and a Junior Wilderness Explorer named Russell into the air.
While in the air, Carl's house runs afoul of a terrifying storm, and eventually crash lands near where Carl plans to put his house, Paradise Falls . This forces Carl and Russell to carry the floating house to the falls, which turns out to be a long walk. In the end, Carl leaves the house behind, right next to Paradise Falls, just as Ellie pictured it.
- The house is loosely based on the house of former-Imagineer Marc Davis