Jessica Walter

Morgan LeFay

Anne-Marie Martin

Clea Lake

Philip Sterling

Dr Frank Taylor, Chief of Psychiatry

John Mills

Thomas Lindmer

June Barrett

Sarah

Sarah Rush

Nurse

Diana Webster

Head Nurse

Bob Delegall

Intern

Larry Anderson

Magician

Blake Marion

Department Chief

Lady Rowlands

Mrs. Sullivan

Ines Pedroza

Announcer

Michael Clark

Taxi Driver

Frank Catalano

Orderly

Michael Ansara

The Ancient One (voice) (uncredited)

Ted Cassidy

Demon Balzaroth (voice) (uncredited)

David Hooks

The Nameless One (uncredited)