Natasha Henstridge

Character: Sil

Ben Kingsley

Character: Xavier Fitch

Michael Madsen

Character: Preston Lennox

Marg Helgenberger

Character: Dr. Laura Baker

Alfred Molina

Character: Dr. Stephen Arden

Forest Whitaker

Character: Dan Smithson, Empath

Michelle Williams

Character: Young Sil

Jordan Lund

Character: Aide

Herta Ware

Character: Mrs. Morris

William Utay

Character: Colleague

Don Fischer

Character: Aide

Scott McKenna

Character: Train Hobo

Virginia Morris

Character: Mother

Jayne Luke

Character: Snack Shop Clerk

David K. Schroeder

Character: German Tourist

David Jensen

Character: Conductor

Esther Scott

Character: Female Conductor

Shirley Prestia

Character: Victoria Roth, Ph.D.

David Selburg

Character: Government Man

Melissa Bickerton

Character: Fitch's Secretary

Lucy Rodriguez

Character: Wedding Dress Saleswoman

Scott Sproule

Character: Team Driver

Stogie Kenyatta

Character: Cop

Gary Bullock

Character: Motel Clerk

Susan Hauser

Character: Lab Worker

William Bumiller

Character: Club Bouncer

Caroline Barclay

Character: Drunken Girl

Matthew Ashford

Character: Guy in Club

Anthony Guidera

Character: Robbie, Guy Picking Up Sil

Sara Lise

Character: Screaming Woman

Whip Hubley

Character: John Carey

Patricia Belcher

Character: Hospital Admittance Clerk

Richard Fancy

Character: Hospital Doctor

Leslie Ishii

Character: Hospital Nurse

Marliese Schneider

Character: Abducted Woman

Robert Mendelson

Character: Homeless Man

Pamela Cook

Character: Commercial Model

Lisa Liberati

Character: Bathroom Bimbo

Ed Stone

Character: Waiter

Dendrie Taylor

Character: Marie

Kurtis Burow

Character: Baby Boy

Dana Hee

Character: Creature Performer

Frank Welker

Character: Alien Sil (voice)

Justin Armao

Character: Bystander (uncredited)

Jellybean Benítez

Character: Club DJ (uncredited)

Greg Bronson

Character: Special Forces (uncredited)

Jimmy Chunga

Character: Commando (uncredited)

James Ent

Character: Lt. Steele (uncredited)

Roman Güttinger

Character: Doctor (uncredited)

Christopher Ivins

Character: Soldier (uncredited)

Zak Knutson

Character: Club Doorman (uncredited)

Coati Mundi

Character: Conga Player (uncredited)

Jason Newell

Character: Special Forces (uncredited)