John Belushi

as John 'Bluto' Blutarski

Karen Allen

as Katy

Tom Hulce

as Larry 'Pinto' Kroger

Stephen Furst

as Kent 'Flounder' Dorfman

Mark Metcalf

as Doug Neidermeyer

Mary Louise Weller

as Mandy Pepperidge

Martha Smith

as Barbara Sue 'Babs' Jansen

John Vernon

as Dean Vernon Wormer