Monsters vs. Aliens (2009) - Cast

Seth Rogen as B.O.B. (voice)
Paul Rudd as Derek (voice)
Hugh Laurie as Dr. Cockroach Ph.D. (voice)
Will Arnett as The Missing Link (voice)
Reese Witherspoon as Susan Murphy / Ginormica (voice)
Kiefer Sutherland as General W.R. Monger (voice)
Rainn Wilson as Gallaxhar (voice)
Stephen Colbert as The President of the United States (voice)