John Belushi
as John "Bluto" Blutarsky
Tim Matheson
as Eric "Otter" Stratton
Tom Hulce
James Widdoes
as Robert Hoover
Mary Louise Weller
as Mandy Pepperidge
Martha Smith
as Barbara "Babs" Jansen
Stephen Furst
as Kent "Flounder" Dorfman
Peter Riegert
Thomas Hulce
as Larry "Pinto" Kroger
Sarah Holcomb
as Clorette DePasto
James Daughton
as Greg Marmalard