'Monsters University' Trailer Reunites Sulley and Mike (Video)

Disney/Pixar has released the trailer for Monsters University a year before the film hits theaters. The animated prequel to the 2001 hit Monsters Inc. features two familiar and beloved characters -- Sulley and Mike -- in a college dorm.

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Four slightly altered editions of the promo -- released Wednesday on iTunes, Yahoo, Huffington Post and Disney's website -- have different one-liners in a scene involving Sulley (John Goodman) playing a prank on Mike (Billy Crystal). The latter is unamused by Sulley's partying ways, and each clip ends with Mike hanging from the ceiling, so to speak.

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The movie arrives June 21, 2013. Pixar's Scottish fantasy adventure Brave, featuring the voices of Kelly Macdonald, Emma Thompson, Billy Connelly and Craig Ferguson, opens Friday.

Watch the iTunes version of the Monsters University trailer below.