George C. Scott

John Russell

Trish Van Devere

Claire Norman

Melvyn Douglas

Senator Carmichael

John Colicos

Captain DeWitt

Barry Morse

Parapsychologist

Madeleine Sherwood

Mrs. Norman

Eric Christmas

Albert Harmon

Frances Hyland

Mrs. Grey

Ruth Springford

Minnie Huxley

James B. Douglas

Eugene Carmichael

J. Kenneth Campbell

Security Guard

Roberta Maxwell

Eva Lingstrom

Bernard Behrens

Robert Lingstrom

Jean Marsh

Joanna Russell

Terence Kelly

Sergeant Durban

Hagan Beggs

Coroner

Anna Hagan

Secretary

Antonia Rey

Estancia

Sammy Smith

Doorman

Kyle MacLachlan

Uncredited