Stuart Whitman

Dale Nelson / Arthur

Roddy McDowall

Martin Ashley

Carol Lynley

Cynthia Lee Albright

Lauren Bacall

Dr. Edwina Beighley

Olive Deering

Mrs. Mellon

Timothy Carey

Hulking patient

Ossie Davis

Capshaw

Donald Buka

Psychologist

Paulene Myers

Dr. Walden (as Pauline Myers)

Evadne Baker

Intern

Robert J. Wilke

Technician Mike Newton (as Robert Wilke)

Bert Freed

Frank Josephson

Judith De Hart

Matron

Judson Laire

Harley Manning

Jonathan Gilmore

A Young Mental Patient

Templeton Fox

Miss Lindsey

William Douglas

Paranoid Patient

Merritt Bohn

Jury Foreman

Don Marshall

Singer