John Cusack as David

Bobby Coleman as Dennis

Amanda Peet as Harlee

Sophie Okonedo as Sophie

Joan Cusack as Liz

Oliver Platt as Jeff

Richard Schiff as Lefkowitz

Taya Calicetto as Esther

David Kaye as Andy

Braxton Bonneville as Nicholas

Samuel Charles as Jonas

Zak Ludwig as Young David

Samuel Patrick Chu as Boy at Group Home

Ryan Morrissette as Boy at Group Home

Nimet Kanji as Housekeeper

Howard Hesseman as Dr. Berg

Carmen Moore as Miss Margie

Beverley Breuer as Mrs. Tompkins

Jonathan Holmes as Dracoban Director

Andrew McIlroy as Earl of Dracoban

Kimani Ray Smith as Draconian Warrior

Peter Bryant as Policeman at School

David James Lewis as Leonard

Edmond Kato Wong as Linus

Joanna Reid as Cashier

Simon Hayama as Baseball Fan

Lauro David Chartrand-DelValle as Tough Cop (Stunt / Crash)

Alberto Ghisi as Tough Boy at School

Hrothgar Mathews as Committee Member

Robert Clarke as Observatory Director

Daniel Pepper as Cop (David's House)

Tony Alcantar as Barber

Angela Besharah as Mary in Photos

Suzy Joachim as Jeff's Date at BBQ

Anjelica Huston as Mimi