Obviously Aitken/Horror was inspired by the 1966 Hammer Film Productions film of the same name. In Dracula Prince Of Darkness, Christopher Lee reprises his role as the bloodthirsty Count; a role he originally played in 1958 when he starred alongside ongoing screen nemesis Peter Cushing in director Terence Fisher's original production of Stoker's Dracula called The Horror Of Dracula.
I first saw this one on Chiller Theatre when I was a kid. I know I probably still have the edited for late night television version, complete with all the period correct commercials from 1983, on a moldy VHS somewhere. I remember fighting off sleep like a champ just to make it until 1:30 AM with the absolute intention of using the hard wired remote to pause recording whenever they went to a commercial break. Now either one of two things happened... I would stay awake just long enough for the movie to start getting too scary and would then just leave the VCR to do its work without me. That way I could therefore pick up where I left off the next day when the sun was shining outside and the family room didn't feel so menacing. Or, if I knew there was no chance of me making it to Chiller Theatre's time slot, I would just put the VCR on its lowest speed and hit record before passing out on the sofa. Now... if I remember correctly, Dracula Prince Of Darkness was one that required a mid-movie autopilot.