David Duchovny

Character: Agent Fox Mulder

Gillian Anderson

Character: Agent Dana Scully

Mitch Pileggi

Character: Assistant Director Walter Skinner

William B. Davis

Character: The Cigarette-Smoking Man

John Neville

Character: The Well-Manicured Man

Martin Landau

Character: Kurtzweil

Jeffrey DeMunn

Character: Bronschweig

Tom Braidwood

Character: Frohike

Blythe Danner

Character: Cassidy

Terry O'Quinn

Character: Michaud

Dean Haglund

Character: Langly

Bruce Harwood

Character: Byers

Armin Mueller-Stahl

Character: Strughold

Lucas Black

Character: Stevie

Christopher Fennell

Character: 2nd Boy

Cody Newton

Character: 3rd Boy

Blake Stokes

Character: 4th Boy

Don S. Williams

Character: Group Elder

George Murdock

Character: 2nd Elder

Michael Shamus Wiles

Character: Black-Haired Man

Darrell Davis

Character: Primitive #1

Carrick O'Quinn

Character: Primitive #2

Tom Woodruff Jr.

Character: Creature #1

Greg Ballora

Character: Creature #2

Ted King

Character: FBI Agent on Roof

Luis Beckford

Character: FBI Agent

Steve Rankin

Character: Field Agent

Gary Grubbs

Character: Fire Captain Cooles

Steven M. Gagnon

Character: Last Agent Out

Larry Joshua

Character: DC Cop

Glendon Rich

Character: DC Cop #2

Gunther Jenson

Character: Security Guard

Scott Alan Smith

Character: Technician

Ian Ruskin

Character: Well-Manicured Man's Valet

Paul Welterlen

Character: Control Room Operator

Joel Traywick

Character: Young Naval Guard

Milton Johns

Character: British Valet

Michael Krawic

Character: 2nd Paramedic

Larry Rippenkroeger

Character: Towncar Driver

Josh McLaglen

Character: Buzz Mihoe

Randy Hall

Character: Windbreakered Agent

T.C. Badalato

Character: Fireman

Amine Zary

Character: Tunisian

David Paris

Character: Pilot

Vanessa Morley

Character: Young Samantha Mulder (archive footage)

Jason Beghe

Character: FBI Man at Bomb Site (uncredited)

Glenne Headly

Character: Barmaid (uncredited)