Carl Fredricksen is 78 years old. When Carl was a child, he met and eventually married a girl named
Ellie who grew up in a small midwestern town. Ellie always dreamed of exploring the mountains, but she died before she got a chance. Now, when developers threaten to move him into an assisted living home, Carl decides to fulfill his promise to Ellie. To accomplish this, he befriends a chubby eight-year-old Wilderness Explorer named
Russell. The two opposites match up for thrilling adventures as they encounter wild terrain, unexpected villains, and all the terrifying creatures that wait in the jungle.