ROARING RIVALS (DISNEY/PIXAR MONSTERS UNIVERSITY)    Mike Wazowski and James P. "Sulley" Sullivan are an inseparable pair, but that wasn't always the case. From the moment these two mismatched monsters met, they couldn't stand each other. The prequel to Disney/Pixar's blockbuster hit Monsters, Inc., Monsters University unlocks the door to how Mike and Sulley overcame their differences and became the best of friends. Screaming with laughter and fun, the film opens on June 21, 2013, and will be shown in Disney Digital 3-D(TM) in select theaters. Children ages 3 to 7 will be thoroughly engrossed by this Monsters University pictureback, which features furry monsters and full-color art.