This very Dark moody episode, "Speak of the Devil" must have inspired Rosemarys Baby movie and "A Sacrifice in Blood" preceded the movie The Omen but also must have served as inspiration for it. I have commented often on various episodes of Mystery Theater that must have "inspired" ideas for book, movies, and TV Shows by people who are my age and older so I know they listened to Radio programs and must have taken notes! But this episode Speak of the Devil, aptly named if you take note of what happens after a person mentions the Devil, is a really great one in my opinion, the setting, acting, mood are very good. CBSRMT at its dark best. Other dark episodes are "Promise to Kill", "Deadly Hour", "Star Sapphire" and "White Wolf" and perhaps "Cezar Curse".