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

Jack Angel as Teddy (voice)

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

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

John Harmon as Medic Mecha (uncredited)