When actress Sarah Marshall dumps aspiring musician Peter Bretter for rock star Aldous Snow, Peter's world comes crashing down. His best friend Brian suggests that Peter should get away from everything and to fly off to Hawaii to escape all his problems. After arriving in Hawaii and meeting the beautiful receptionist Rachel Jansen, Peter is shocked to see not only Aldous in Hawaii, but also Sarah.
Jason Segel
as Peter Bretter
Kristen Bell
as Sarah Marshall
Mila Kunis
as Rachel Jansen
Russell Brand
as Aldous Snow
Bill Hader
as Brian Bretter
Jonah Hill
as Matthew Van Der Wyk
Liz Cackowski
as Liz Bretter
Jack McBrayer
as Darald
Maria Thayer
as Wyoma
Paul Rudd
as Chuck
Jason Bateman
as Animal Instincts Detective
William Baldwin
as Detective Hunter Rush
