Arthur Hill

Dr. Jeremy Stone

David Wayne

Dr. Charles Dutton

James Olson

Dr. Mark Hall

Kate Reid

Dr. Ruth Leavitt

Paula Kelly

Karen Anson

George Mitchell

Jackson

Ramon Bieri

Major Manchek

Peter Hobbs

General Sparks

Kermit Murdock

Dr. Robertson

Richard O'Brien

Grimes

Eric Christmas

Senator from Vermont

Mark Jenkins

Lt. Shawn (Piedmont team)

Peter Helm

Sgt. Crane (Piedmont team)

Joe Di Reda

Wildfire Computer Sgt. Burk

Carl Reindel

Lt. Comroe

Ken Swofford

Toby (technician)

Frances Reid

Clara Dutton

Richard Bull

Air Force Major

John Carter

MP Capt. Morton

Glenn Langan

Cabinet Secretary (uncredited)

Sandra de Bruin

Technician (uncredited)

Susan Brown

Allison Stone (uncredited)

Bart La Rue

Medic Captain (uncredited)

Walter Brooke

Assistant to Cabinet Secretary (uncredited)

Jan Burrell

Mother - Piedmont (uncredited)

Dee Carroll

Technician (uncredited)

Michael Crichton

Bearded Surgeon (uncredited)

David McLean

Sen. McKenzie (uncredited)

Emory Parnell

Pete 'Old Doughboy' Arnold (uncredited)

Michael Pataki

Operator of 'The Hand' (uncredited)

Quinn K. Redeker

Capt. Morris (uncredited)

Garry Walberg

Technician (uncredited)

Len Wayland

Utah Crash Site Officer (uncredited)

Jason Johnson

Dr. Benedict (uncredited)

Ivor Barry

Murray (uncredited)

Lance Fuller

Man (uncredited)

Don Messick

Alarm (voice) (uncredited)

Joan Swift

Decontamination Receptionist (uncredited)

Alma Platt

Woman (uncredited)

Paul Ballantyne

Hospital Director (uncredited)

Benjie Bancroft

Police Officer (uncredited)

Joe Billings

Scientist (uncredited)

Patty Bodeen

Girl (uncredited)

Michael Bow

MP at Stone's (uncredited)

Duke Cigrang

Father - Piedmont (uncredited)

Rhodie Cogan

Minor Role (uncredited)

Lisa Daniels

Woman (uncredited)

Bill Dunbar

Vandenberg AFB Sergeant (uncredited)

Harold Dyrenforth

Minor Role (uncredited)

Walker Edmiston

Voice (voice) (uncredited)

Sandra Ego

Girl (uncredited)

Don Ellis

Minor Role (uncredited)

Judy Farrell

Pam (uncredited)

James W. Gavin

Dempsey - Helicopter Pilot (uncredited)

Sheila Jo Guthrie

Girl - Piedmont (uncredited)

Robert L. Hughes

Air Force Technician (uncredited)

Jamie Lamb

Boy - Piedmont (uncredited)

Johnny Lee

Boy (uncredited)

Theodore Lehmann

Scientist (uncredited)

Tom McDonough

Stetson (uncredited)

Cliff Medaugh

Civilian (uncredited)

Victoria Paige Meyerink

Minor Role (uncredited)

Midori

Bess - Lab Technician (uncredited)

Carl B. Morrison

Minor Role (uncredited)

Francisco Ortega

Gateman at Agricultural Center (uncredited)

Georgia Schmidt

Old Lady - Piedmont (uncredited)

Reuben Singer

Dr. Rudolph Karp (uncredited)

Gilchrist Stuart

Man (uncredited)

Lorna Thayer

Woman (uncredited)

Gary Waynesmith

Air Force Technician (uncredited)

Russ Whiteman

Civilian (uncredited)