Special Agent Fox Mulder
David Duchovny
Special Agent Dana Scully
Gillian Anderson
The Well-Manicured Man
John Neville
The Cigarette-Smoking Man
William B. Davis
Alvin Kurtzweil, MD
Martin Landau
Assistant Director Walter Skinner
Mitch Pileggi
Ben Bronschweig, M.D.
Jeffrey DeMunn
Jana Cassidy
Blythe Danner
Darius Michaud
Terry O'Quinn
Conrad Strughold
Armin Mueller-Stahl
Boy #2 (as Chris Fennell)
Christopher Fennell
Richard 'Ringo' Langly
Dean Haglund
John Fitzgerald Byers
Bruce Harwood
Melvin Frohike
Tom Braidwood
First Elder
Don S. Williams
Second Elder
George Murdock
Black-Haired Man
Michael Shamus Wiles
Primitive #1 (as Craig Davis)
Darrell Davis
Primitive #2
Carrick O'Quinn
Creature #1
Tom Woodruff Jr.
Creature #2 (as Gregory B. Ballora)
Greg Ballora
FBI Agent on Roof (as T.W. King)
Ted King
Fire Captain Miles Cooles
Gary Grubbs
Last Agent Out
Steven M. Gagnon
D.C. Cop #1 (as Lawrence Joshua)
Larry Joshua
Police Investigator
Glendon Rich
Security Guard (as Gunther Jensen)
Gunther Jenson
Technician (as Scott Smith)
Scott Alan Smith
Well-Manicured Man's Valet
Ian Ruskin
Control Room Operator
Paul Welterlen
Young Naval Guard
Joel Traywick
British Valet
Milton Johns
Paramedic #1 (as Paul Tuerpé)
Paul Tuerpe
Paramedic #2 (as Michael A. Krawic)
Michael Krawic
Towncar Driver
Larry Rippenkroeger
Windbreakered Agent
Randy Hall
Pilot (as David W. Paris)
David Paris
Young Samantha Mulder (archive footage)
Vanessa Morley