Carl Fredericksen, a retired balloon salesman, is part rascal and part dreamer who is ready for his last chance at high-flying excitement. Tying thousands of balloons to his house, Carl sets off to the lost world of his childhood dreams. Unbeknownst to Carl, Russell, an overeager eight-year-old Wilderness Explorer who has never ventured beyond his backyard, is in the wrong place at the wrong time. The world's most unlikely duo reach new heights and meet fantastic friends. Stuck together in the wilds of the jungle, Carl realizes that sometimes life's biggest adventures aren't the ones you set out looking for.