Michael Caine character Brad Crane
Katharine Ross character Helena Anderson
Richard Widmark character Gen. Thaddeus Slater
Richard Chamberlain character Dr. Hubbard
Olivia de Havilland character Maureen
Ben Johnson character Felix
Lee Grant character Anne MacGregor
José Ferrer character Dr. Andrews
Patty Duke character Rita
Slim Pickens character Jud Hawkins
Bradford Dillman character Maj. Baker
Fred MacMurray character Clarance Tuttle
Henry Fonda character Dr. Walter Krim
Cameron Mitchell character Gen. Thompson
Christian Juttner character Paul Durant
Alejandro Rey character Dr. Martinez
Don Barry character Pete Harris
Morgan Paull character Dr. Newman
Arthur Space character Train Engineer
Arell Blanton character Sergeant
Chris Petersen character Hal
Barbara Costello character Receptionist / Nurse (extended version only)
Jenifer Taurins character Nurse (extended version only)
David Himes character Radioman (extended version only)
