Character Name : Sgt. Ben Peterson

Original Name : James Whitmore

Gender : Male

Character Name : FBI Agent Robert Graham

Original Name : James Arness

Gender : Male

Character Name : Dr. Pat Medford

Original Name : Joan Weldon

Gender : Female

Character Name : Dr. Harold Medford

Original Name : Edmund Gwenn

Gender : Male

Character Name : Brig. Gen. Robert O'Brien

Original Name : Onslow Stevens

Gender : Male

Character Name : Maj. Kibbee

Original Name : Sean McClory

Gender : Male

Character Name : The Ellinson Girl

Original Name : Sandy Descher

Gender : Female

Character Name : Trooper Ed Blackburn

Original Name : Chris Drake

Gender : Male

Character Name : Trooper Capt. Fred Edwards

Original Name : Don Shelton

Gender : Male

Character Name : Alan Crotty

Original Name : Fess Parker

Gender : Male

Character Name : Mrs. Lodge

Original Name : Mary Alan Hokanson

Gender : Female

Character Name : Jensen

Original Name : Olin Howland

Gender : Male

Character Name : Ambulance Attendant

Original Name : William Schallert

Gender : Male

Character Name : Child Psychiatrist

Original Name : Ann Doran

Gender : Female

Character Name : Railroad Yard Watchman

Original Name : Dub Taylor

Gender : Male

Character Name : Army Sergeant

Original Name : Leonard Nimoy

Gender : Male

Character Name : Bald Reporter at L.A. News Conference

Original Name : Richard Deacon

Gender : Male

Character Name : Government Official

Original Name : Forbes Murray

Gender : Male

Character Name : Trooper #2

Original Name : Kenner G. Kemp

Gender : Male

Character Name : Soldier

Original Name : Charles Perry

Gender : Male

Character Name : Matron

Original Name : Dorothy Green

Gender : Female

Character Name : Official at D.C. Meeting

Original Name : Willis Bouchey

Gender : Male

Character Name : Blonde at Police Station

Original Name : Mary Lou Holloway

Gender : Male

Character Name : Teenager in Police Station

Original Name : Dick York

Gender : Male