Monsters vs. Aliens (Also Known As: Monstruos vs. Aliens) is an Animation, Action, Adventure film directed by Rob Letterman and written by Maya Forbes. It was released on 27 March 2009 (USA). It stars Reese Witherspoon, Rainn Wilson, Stephen Colbert. The film’s content : A woman transformed into a giant after she is struck by a meteorite and becomes part of a team of monsters sent in by the U.S. government..