Monsters Inc. was one or Pixar's early hits, released in 2001 as the company's fourth movie. Pete Docter and David Silverman co-directed the pic, which featured voicework from John Goodman and Billy Crystal as fright engineers Sully and Mike Wazowski. The movie scared up $525 million worldwide.

Sully/Goodman and Wazowski/Crystal are expected to be back as will monster bad guy Randall Boggs (voices by Steve Buscemi). Disney has scheduled the sequel for a 2012 release.

The premise for the new movie is under lock and key although Disney said it will be a prequel.