Hard to believe that so many others have rated this one so highly. Sondra Locke might've wowed Clint, but to me she's always vaguely resembled a big sardine in a blonde wig, and here she's called upon to play someone of reputedly ineffable beauty, the whole while acting with a capital A (until she is outdone in this regard by Mallory's next bimbo in line, one Cara Burgess). Lloyd proves capable in a one-dimensional role, but the only one who really adds any style to the proceedings is Baddeley (AKA Mrs Naugatuck) in her all too brief stint.
What atmosphere has been built up is quickly dissipated in the climax, when the Monster appears on screen. I literally laughed out loud when I saw this specimen balloon up and straddle Locke, like some clip from a cartoon. Unfortunately this segment is imbued with the self-parody toward which Night Gallery was frequently prone.