Haley Joel Osment
as David

Jude Law
as Gigolo Joe

Frances O'Connor
as Monica Swinton

Sam Robards
as Henry Swinton

Jake Thomas
as Martin Swinton

William Hurt
as Prof. Hobby

Robin Williams
as Dr. Know (voice)

Ben Kingsley
as Specialist (voice)

Meryl Streep
as Blue Mecha (voice)

Chris Rock
as Comedian (voice)

Ken Leung
as Syatyoo-Sama

Clark Gregg
as Supernerd

Kevin Sussman
as Supernerd

Tom Gallop
as Supernerd

Eugene Osment
as Supernerd

April Grace
as Female Colleague

Matt Winston
as Executive

Sabrina Grdevich
as Sheila

Theo Greenly
as Todd

Michael Mantell
as Dr. Frazier at Cryogenic Institute

Keith Campbell
as Roadworker

Brian Turk
as Backstage Bull

Brendan Gleeson
as Lord Johnson-Johnson

Christopher Dye
as Flesh Fair Participant

Jack Angel
as Teddy (voice)

Tim Rigby
as Yeoman

Enrico Colantoni
as The Murderer

Adrian Grenier
as Teen in Van

Matt Malloy
as Robot Repairman

Brent Sexton
as Russell

Erik Bauersfeld
as Gardener (Voice)

Michael Fishman
as Teen in Van

Diane Fletcher
as Sentient Machine Security

Al Jourgensen
as Flesh Fair Band Member

Paul Barker
as Flesh Fair Band Member

Vito Carenzo
as Big Man

Adam Grossman
as Flesh Fair Band Member

Rena Owen
as Ticket Taker

Adam Alexi-Malle
as Crowd Member

Laurence Mason
as Tech Director

Ashley Scott
as Gigolo Jane

Ty Coon
as Flesh Fair Band Member

Duane Buford
as Flesh Fair Band Member

Max Brody
as Flesh Fair Band Member

Red King
as Covert Information Retrieval

Claude Gilbert
as Cybertronics - Room 93056

Kate Nei
as Toe Bell Ringing

Laia Salla
as Mr. Chan's Assistant

Jeanine Salla
as Sentient Machine Therapist

Mark Allan Staubach
as Teen in Van

Miguel Pérez
as Robot Repairman

Billy Scudder
as Mechanic

Bobby Harwell
as TV Face

Wayne Wilderson
as Comedian

R. David Smith
as Welder

Eliza Coleman
as General Circuita

Jim Jansen
as Chef

Tim Rhoze
as Laboratory Technician

Clara Bellar
as FemMecha Nanny

Kelly McCool
as Kate the Holographic Girl

Michael Shamus Wiles
as Cop

Jason Sutter
as Percussionist

Ken Palmer
as Percussionist

J. Alan Scott
as Worker

Lily Knight
as Voice in the Crowd (voice)

Justina Machado
as Assistant

Daveigh Chase
as Child Singer (scenes deleted)

Kathryn Morris
as Teenage Honey

Hunter King
as Amanda

Michael Berresse
as Stage Manager

Paula Malcomson
as Patricia in Mirrored Room

John Prosky
as Mr. Williamson, the Bellman

Curt Youngberg
as Kid

Andy Morrow
as Kid

Dillon McEwin
as Kid

Jeremy James Kissner
as Kid