Well there was a programme shown in schools called Look and Read. During each programme they showed a serial. One of those was a 10-part serial called Dark Towers. There was a character in it who scared me, called the White Knight.
Rod Serling's, Night Gallery used to scare the bajeezus outta me when I was a kid. Although I didn't watch Dark Shadows. I do remember seeing an episode of it at one of my Aunts house and getting the heebie jeebies.
When I was a kid there was basically only The Outer Limits and Twilight Zone. But what really scared the hell out of me was the opening theme to Perry Mason, I don't know why but it sure freaked me out