V Aliens Cast — Monsters

: Voiced by Reese Witherspoon . Susan is a young woman who grows to over 50 feet tall after being struck by a meteorite [10, 32].

: Voiced by Paul Rudd . Susan’s self-absorbed fiancé and local weatherman [10, 32]. Gallaxhar's Computer : Voiced by Amy Poehler [1, 10]. News Reporter : Voiced by Ed Helms [1, 13]. Additional Voices Monsters V Aliens Cast

: Voiced by Seth Rogen . A gelatinous, brainless, and indestructible blue mass [10, 30]. : Voiced by Reese Witherspoon

: Susan's parents are voiced by Jeffrey Tambor and Julie White [10, 13]. Additional Voices : Voiced by Seth Rogen

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 Renée Zellweger and John Krasinski , respectively. They play a couple whose date is interrupted by an alien landing [10, 37].

: Voiced by Stephen Colbert . The impulsive and dimwitted President of the United States [10, 25].