Actor Kiefer Sutherland, who gives voice to General W.R. Monger in the movie, poses at the premiere of "Monsters vs. Aliens" at the Gibson amphitheatre in Universal City, California March 22, 2009. The movie opens in the U.S. on March 27. [Agencies]

Actress Reese Witherspoon, who gives voice to Ginormica in the movie, poses with directors Rob Letterman (L) and Conrad Vernon at the premiere of "Monsters vs. Aliens" at the Gibson amphitheatre in Universal City, California March 22, 2009. The movie opens in the U.S. on March 27. [Agencies]