Ryan Reynolds

as Michael Leslie "Berg" Bergen

Richard Ruccolo

as Peter "Pete" Dunville

Traylor Howard

as Sharon Carter Donnelly

Suzanne Cryer

as Ashley "Ash" Walker

Nathan Fillion

as Johnny Donnelly

Jillian Bach

as Irene

Julius Carry

as Bill

David Ogden Stiers

as Mr. Bauer

Giuseppe Andrews

as Germ

Jennifer Westfeldt

as Melissa