Elizabeth Montgomery
— Katherine Merrill
Anthony Hopkins
— Dr. Michael Grant
Michele Lee
— Dolores Marsh
Janet MacLachlan
— Eileen
Michael Lerner
— Manny
John Elerick
— Jeremy
Herbert Berghof
— Dr. Kassiter
Vic Tayback
— Archie
Mario Roccuzzo
— Sandy
Julie Rogers
— Veronica
Edgar Daniels
— Zalenki
James Ingersoll
— Dr. Snyder
Jack Manning
— Sam
Garrick Russell
— Eileen's Son
Eric Server
— Dr. Birney
Deborah White
— Janet
Michael Thoma
— Sid (uncredited)