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
Dean Haglund character Langly
Bruce Harwood character Byers
Tom Braidwood character Frohike
Blythe Danner character Cassidy
Terry O'Quinn character Michaud
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)