His series of macabre films include House of Dark Shadows, Night of Dark Shadows, The Night Stalker (for many years holding the record ratings of the most-watched TV movie—and inspired the series Kolchak: The Night Stalker), Intruders, The Night Strangler, Burnt Offerings, Trilogy of Terror, The Norliss Tapes (a 1973 pilot for an unproduced series starring Roy Thinnes), Curse of the Black Widow, Dead of Night, Scream of the Wolf and others. He worked frequently with sci-fi/horror Writer Richard Matheson. Curtis was Producer and/or Director of a number of television adaptations of horror-related productions including The Strange Case of Dr. Jekyll and Mr. Hyde (1968), Dracula (1973), Frankenstein (1973), The Picture of Dorian Gray (1973), and The Turn of the Screw (1974).