Up is a 2009 American computer-animated comedy-adventure film. It centers on an elderly widower named Carl Fredricksen and an earnest young Wilderness Explorer named Russell who fly to South America by floating in a house. The film has received universal critical acclaim, with a rating of 98% on Rotten Tomatoes (the best reviewed wide-released film of 2009 on the site), and grossed over $731 million worldwide, making it Pixar's third-most commercially successful film, behind Toy Story 3 and Finding Nemo.

Young Carl Fredricksen is a shy, quiet boy who idolizes renowned explorer Charles F. Muntz. He is saddened to learn, however, that Muntz has been accused of fabricating the skeleton of a giant bird he had claimed to have discovered in Paradise Falls, Venezuela, South America, and the organization fires him. Muntz needed a plan to clear his name. So he vows to return to Paradise Falls to capture the bird alive, and he will not return until he does. One day, Carl befriends an energetic and somewhat eccentric tomboy named Ellie, who is also a Muntz fan. She confides to Carl her desire to move her "clubhouse" -- an abandoned house in the neighborhood -- to a cliff overlooking Paradise Falls, making him promise to help her. Carl and Ellie eventually get married and grow old together in the restored house, working as a toy balloon vendor anda zookeeper, respectively. When they are told by a doctor that they are unable to have children together, they repeatedly pool their savings for a trip to Paradise Falls, but end up spending it on more pressing needs. An elderly Carl finally arranges for the trip, but Ellie suddenly becomes ill and dies, leaving him alone.

However, Carl comes up with a scheme to keep his promise to Ellie: he turns his house into a makeshift airship, using thousands of helium balloons to lift it off its foundation. A young member of the"Wilderness Explorers" (a fictional youth organization analogous to the Boy Scouts of America) named Russell becomes an accidental passenger, having pestered Carl earlier in an attempt to earn his final merit badge, "Assisting the Elderly".

Up received critical acclaim, with most reviewers commending the humor and heart of the film. Edward Asner was praised for his portrayal of Carl, and a montage of Carl and his wife Ellie aging together was widely lauded. The film received five Academy Award nominations, including Best Picture, making it the second animated film in history to receive such a nomination, following Beauty and the Beast (1991).