Kristen Wiig
as Cynthia Morehouse
Tobey Maguire
as Devon Morehouse
Will Ferrell
as Eric Jonrosh
Tim Robbins
as Jonas Morehouse
Haley Joel Osment
as Winston Morehouse
Jessica Alba
as Dixie Mellonworth
Val Kilmer
as General Rod Cauliffe
Steve Tom
as General Herman Maddoxton
Carey Mulligan
as Lady Anne York
Molly Shannon
as Meredith Sennheiser
Michael Sheen
as Chet Halner
David Spade
as Talc Munson