Peter Hooten as Dr. Stephen Strange

Clyde Kusatsu as Wong

Jessica Walter as Morgan LeFay

Anne-Marie Martin as Clea Lake

Philip Sterling as Dr Frank Taylor, Chief of Psychiatry

John Mills as Thomas Lindmer

June Barrett as Sarah

Sarah Rush as Nurse

Diana Webster as Head Nurse

Bob Delegall as Intern

Larry Anderson as Magician

Blake Marion as Department Chief

Lady Rowlands as Mrs. Sullivan

Ines Pedroza as Announcer

Michael Clark as Taxi Driver

Frank Catalano as Orderly

Michael Ansara as The Ancient One (voice) (uncredited)

Ted Cassidy as Demon Balzaroth (voice) (uncredited)

David Hooks as The Nameless One (uncredited)