EnglishArthur Hill as Dr Jeremy Stone
David Wayne as Dr Charles Dutton
James Olson as Dr Mark Hall
Kate Reid as Dr Ruth Leavitt
Paula Kelly as Karen Anson
George Mitchell as Jackson
Ramon Bieri as Maj Manchek
Kermit Murdock as Dr Robertson
Richard O'Brien as Grimes
Peter Hobbs as Gen Sparks
Eric Christmas as Senator from Vermont
Mark Jenkins as Lt Shawn (Piedmont team)
Peter Helm as Sgt Crane (Piedmont team)
Joe Di Reda as Wildfire Computer Sgt Burk
Carl Reindel as Lt Comroe
Ken Swofford as Toby (technician)
Frances Reid as Clara Dutton
Richard Bull as Air Force Major
John Carter as MP Capt Morton
Paul Ballantyne as Hospital director
Ivor Barry as Murray
Joe Billings as Scientist
Michael Bow as MP at Stone's
Walter Brooke as Assistant to Cabinet Secretary
Susan Brown as Allison Stone
Jan Burrell as Mother (Piedmont)
Dee Carroll as Technician
Duke Cigrang as Father (Piedmont)
Michael Crichton as Bearded surgeon
Lisa Daniels as Woman
Sandra de Bruin as Technician
Bill Dunbar as Vandenberg AFB sergeant
Walker Edmiston as Voice
Judy Farrell as Pam
Lance Fuller as Man
James W Gavin as Dempsey (helicopter pilot)
Ray Harris as Scientist
Rob Hughes as Air Force technician
Jason Johnson as Dr Benedict
Glenn Langan as Cabinet Secretary
Bart La Rue as Medic captain
Johnny Lee as Boy
Theodore Lehmann as Scientist
Tom McDonough as Stetson
David McLean as Sen McKenzie (New Mexico)
Cliff Medaugh as Civilian
Midori as Bess (lab technician)
Francisco Ortega as Gateman at Agricultural Center
Emory Parnell as Pete 'Old Doughboy' Arnold
Michael Pataki as Operator of 'The Hands'
Alma Platt as Woman
Ford Rainey as Bit Part
Quinn K Redeker as Capt Morris
Georgia Schmidt as Old lady (Piedmont)
Reuben Singer as Dr Rudolph Karp
Robert Soto as Manuel Rios (the baby)
Gilchrist Stuart as Man
Joan Swift as Decontamination receptionist
Lorna Thayer as Woman
Garry Walberg as Technician
Len Wayland as Utah crash site officer
Gary Waynesmith as Air Force technician
Russ Whiteman as Civilian