Monsters, Inc. is Pixar’s fourth feature film. It was released in theatres on November 2, 2001, and re-released in 3D on December 19, 2012. A prequel to the film, Monsters University, was released on June 21, 2013. Set in an alternate dimension run by monsters, Monsters Inc. features monsters working in the Monsters, Inc. factory where monsters enter the Human World to scare children so their screams can power the Monster World. However, when a human girl named Boo enters their world, top scarer James P. Sullivan and his assistant Mike Wazowski must return her.