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: Voiced by Kiefer Sutherland . The military leader in charge of the top-secret monster containment facility [10, 24].
: Voiced by Stephen Colbert . The impulsive and dimwitted President of the United States [10, 25]. Monsters V Aliens Cast
For the TV series spin-off , several roles were recast, with Riki Lindhome taking over as Susan and Chris O'Dowd as Dr. Cockroach [8, 11]. : Voiced by Kiefer Sutherland
: Voiced by Rainn Wilson . The main antagonist, an evil alien overlord seeking the "quantonium" inside Susan [10, 32]. The impulsive and dimwitted President of the United
: Susan's parents are voiced by Jeffrey Tambor and Julie White [10, 13].
: Voiced by Will Arnett . A 20,000-year-old "fish-ape" humanoid who was thawed out by scientists [10, 32].
: A massive mutated larva. The character's vocal effects were provided by the film's co-director, Conrad Vernon [10, 20]. Human and Alien Characters