Monsters vs Aliens— Full Cast

Reese Witherspoon

as Susan Murphy / Ginormica (voice)

Seth Rogen

as B.O.B. (voice)

Hugh Laurie

as Dr. Cockroach Ph.D. (voice)

Rainn Wilson

as Gallaxhar (voice)

Will Arnett

as The Missing Link (voice)

Kiefer Sutherland

as General W.R. Monger (voice)

Paul Rudd

as Derek Dietl (voice)

Stephen Colbert

as President Hathaway (voice)

Julie White

as Wendy Murphy (voice)

Jeffrey Tambor

as Carl Murphy (voice)

Amy Poehler

as Computer (voice)

Ed Helms

as News Reporter (voice)

Renée Zellweger

as Katie (voice)

Sean Bishop

as Private Bullhorn / Helicopter Pilot / Advisor Ortega (voice)

Rich Dietl

as Commander / Advisor Smith (voice)