 Monsters University tells the story of two monsters , Mike and Sulley , and their time studying at college , where they start off as rivals , but slowly become best friends . John Goodman , Billy Crystal , Steve Buscemi , Bob Peterson , and John Ratzenberger reprise their roles as James P. Sullivan , Mike Wazowski , Randall Boggs , Roz , and the Abominable Snowman , respectively . Bonnie Hunt , who played Ms. Flint in the first film , voices Mike 's grade school teacher Ms. Karen Graves . The music for the film is composed by Randy Newman , marking his seventh collaboration with Pixar . 
