Boo

Boo is a 2013 American 3D computer-animated comedy film produced by Pixar Animation Studios for Walt Disney Pictures. It was directed by Dan Scanlon and produced by Kori Rae, with John Lasseter, Pete Docter, Andrew Stanton and Lee Unkrich as executive producers. The music for the film was composed by Randy Newman, making it his seventh collaboration with Pixar. It is a sequel  to Monsters, Inc.(2001). The movie tells the story of "Boo", the small child that the two monsters, Mike and Sulley, got into a tangle with, who is now a grown up adult and loses contact with the two after she's deemed too old to make laugh, in which Mike and Sulley decide to surprise her on her birthday only that they can't find her anywhere and decide to look for her in the human world.

John Goodman, Billy Crystal,  Bob Peterson, John Ratzenburger and Jennifer Tilly all reprise their roles as James P. Sullivan, Mike Wazowski, Roz, the Abominable Snowman and Celia Mae respectively.

Disney, as the rights holder, had plans for a sequel to Monsters, Inc. since 2005. Following disagreements with Pixar, Disney tasked its Circle 7 Animation unit to make the film. An early draft of the film was developed; however, Disney's purchase of Pixar in early 2006 led to the cancellation of Circle 7's version of the film.