Michael Cera as Scott Pilgrim

Mary Elizabeth Winstead as Ramona Flowers

Ellen Wong as Knives Chau

Kieran Culkin as Wallace Wells

Alison Pill as Kim Pine

Mark Webber as Stephen Stills

Johnny Simmons as Young Neil

Jason Schwartzman as Gideon Graves

Anna Kendrick as Stacey Pilgrim

Aubrey Plaza as Julie Powers

Satya Bhabha as Matthew Patel

Chris Evans as Lucas Lee

Brandon Routh as Todd Ingram

Mae Whitman as Roxy Richter

Brie Larson as Envy Adams

Keita Saito as Kyle Katayanagi

Shota Saito as Ken Katayanagi

Will Bowes as Party Goer

Celine Lepage as Party Goer

Mark Leroy as Party Goer

Kjartan Hewitt as Jimmy

Ben Lewis as Other Scott

Nelson Franklin as Comeau

Kristina Pesic as Sandra

Matt Watts as Promoter

Ingrid Haas as Monique

Maurie W. Kaufmann as Joel

Marley Otto as Party Goer

Christine Watson as Demon Hipster Chick

Chantelle Chung as Tamara Chen

Don McKellar as Director

Jung-Yul Kim as Goon

Erik Knudsen as Crash

Abigail Chu as Trasha

Tennessee Thomas as Lynette Guycott

Emily Kassie as Winifred Hailey

Michael Lazarovitch as Some Guy

John Patrick Amedori as Lollipop Hipster

Joe Dinicol as Elevator Hipster

Craig Stickland as Elevator Hipster

Bill Hader as The Voice (voice)

Thomas Jane as Vegan Police (uncredited)

Clifton Collins Jr. as Vegan Police (uncredited)

Bryan Lee O'Malley as Lee's Palace Bar Patron (uncredited)