Natasha Henstridge

Sil

Ben Kingsley

Xavier Fitch

Michael Madsen

Preston Lennox

Marg Helgenberger

Dr. Laura Baker

Alfred Molina

Dr. Stephen Arden

Forest Whitaker

Dan Smithson, Empath

Michelle Williams

Young Sil

Jordan Lund

Aide

Herta Ware

Mrs. Morris

William Utay

Colleague

Don Fischer

Aide

Scott McKenna

Train Hobo

Virginia Morris

Mother

Jayne Luke

Snack Shop Clerk

David K. Schroeder

German Tourist

David Jensen

Conductor

Esther Scott

Female Conductor

Shirley Prestia

Victoria Roth, Ph.D.

David Selburg

Government Man

Melissa Bickerton

Fitch's Secretary

Lucy Rodriguez

Wedding Dress Saleswoman

Scott Sproule

Team Driver

Stogie Kenyatta

Cop

Gary Bullock

Motel Clerk

Susan Hauser

Lab Worker

William Bumiller

Club Bouncer

Caroline Barclay

Drunken Girl

Matthew Ashford

Guy in Club

Anthony Guidera

Robbie, Guy Picking Up Sil

Sara Lise

Screaming Woman

Whip Hubley

John Carey

Patricia Belcher

Hospital Admittance Clerk

Richard Fancy

Hospital Doctor

Leslie Ishii

Hospital Nurse

Marliese Schneider

Abducted Woman

Robert Mendelson

Homeless Man

Pamela Cook

Commercial Model

Lisa Liberati

Bathroom Bimbo

Ed Stone

Waiter

Dendrie Taylor

Marie

Kurtis Burow

Baby Boy

Dana Hee

Creature Performer

Frank Welker

Alien Sil (voice)

Justin Armao

Bystander (uncredited)

Jellybean Benítez

Club DJ (uncredited)

Greg Bronson

Special Forces (uncredited)

Jimmy Chunga

Commando (uncredited)

James Ent

Lt. Steele (uncredited)

Roman Güttinger

Doctor (uncredited)

Christopher Ivins

Soldier (uncredited)

Zak Knutson

Club Doorman (uncredited)

Coati Mundi

Conga Player (uncredited)

Jason Newell

Special Forces (uncredited)