Arthur Hill
Dr. Jeremy Stone
Acting
David Wayne
Dr. Charles Dutton
Acting
James Olson
Dr. Mark Hall
Acting
Kate Reid
Dr. Ruth Leavitt
Acting
Paula Kelly
Karen Anson
Acting
George Mitchell
Jackson
Acting
Ramon Bieri
Major Manchek
Acting
Peter Hobbs
General Sparks
Acting
Kermit Murdock
Dr. Robertson
Acting
Richard O'Brien
Grimes
Acting
Eric Christmas
Senator from Vermont
Acting
Mark Jenkins
Lt. Shawn (Piedmont team)
Acting
Peter Helm
Sgt. Crane (Piedmont team)
Acting
Joe Di Reda
Wildfire Computer Sgt. Burk
Acting
Carl Reindel
Lt. Comroe
Acting
Ken Swofford
Toby (technician)
Acting
Frances Reid
Clara Dutton
Acting
Richard Bull
Air Force Major
Acting
John Carter
MP Capt. Morton
Acting
Glenn Langan
Cabinet Secretary (uncredited)
Acting
Sandra de Bruin
Technician (uncredited)
Acting
Susan Brown
Allison Stone (uncredited)
Acting
Bart La Rue
Medic Captain (uncredited)
Acting
Walter Brooke
Assistant to Cabinet Secretary (uncredited)
Acting
Jan Burrell
Mother - Piedmont (uncredited)
Acting
Dee Carroll
Technician (uncredited)
Acting
Michael Crichton
Bearded Surgeon (uncredited)
Writing
David McLean
Sen. McKenzie (uncredited)
Acting
Emory Parnell
Pete 'Old Doughboy' Arnold (uncredited)
Acting
Michael Pataki
Operator of 'The Hand' (uncredited)
Acting
Quinn K. Redeker
Capt. Morris (uncredited)
Acting
Garry Walberg
Technician (uncredited)
Acting
Len Wayland
Utah Crash Site Officer (uncredited)
Acting
Jason Johnson
Dr. Benedict (uncredited)
Acting
Ivor Barry
Murray (uncredited)
Acting
Lance Fuller
Man (uncredited)
Acting
Don Messick
Alarm (voice) (uncredited)
Acting
Joan Swift
Decontamination Receptionist (uncredited)
Acting
Alma Platt
Woman (uncredited)
Acting
Paul Ballantyne
Hospital Director (uncredited)
Acting
Benjie Bancroft
Police Officer (uncredited)
Acting
Joe Billings
Scientist (uncredited)
Acting
Patty Bodeen
Girl (uncredited)
Acting
Michael Bow
MP at Stone's (uncredited)
Acting
Duke Cigrang
Father - Piedmont (uncredited)
Acting
Rhodie Cogan
Minor Role (uncredited)
Acting
Lisa Daniels
Woman (uncredited)
Acting
Bill Dunbar
Vandenberg AFB Sergeant (uncredited)
Acting
Harold Dyrenforth
Minor Role (uncredited)
Acting
Walker Edmiston
Voice (voice) (uncredited)
Acting
Sandra Ego
Girl (uncredited)
Acting
Don Ellis
Minor Role (uncredited)
Sound
Judy Farrell
Pam (uncredited)
Acting
James W. Gavin
Dempsey - Helicopter Pilot (uncredited)
Acting
Sheila Jo Guthrie
Girl - Piedmont (uncredited)
Acting
Robert L. Hughes
Air Force Technician (uncredited)
Acting
Jamie Lamb
Boy - Piedmont (uncredited)
Acting
Johnny Lee
Boy (uncredited)
Acting
Theodore Lehmann
Scientist (uncredited)
Acting
Tom McDonough
Stetson (uncredited)
Acting
Cliff Medaugh
Civilian (uncredited)
Acting
Victoria Paige Meyerink
Minor Role (uncredited)
Acting
Midori
Bess - Lab Technician (uncredited)
Acting
Carl B. Morrison
Minor Role (uncredited)
Acting
Francisco Ortega
Gateman at Agricultural Center (uncredited)
Acting
Georgia Schmidt
Old Lady - Piedmont (uncredited)
Acting
Reuben Singer
Dr. Rudolph Karp (uncredited)
Acting
Gilchrist Stuart
Man (uncredited)
Acting
Lorna Thayer
Woman (uncredited)
Acting
Gary Waynesmith
Air Force Technician (uncredited)
Acting
Russ Whiteman
Civilian (uncredited)
Acting