The Beast in the Black
This one really scared me as a kid. I just saw it again for the first time in years, probably since the original broadcast. It is definitely creepy. Some strange afterlife dimension guarded by a Beast that is just a pair of glowing red eyes that come at you, a set of disembodied teeth, and a flash of fur moving past you. That was the only part of the episode I remembered, I guess I forgot the other creepy aspect of the show, a possessed Bill Maxwell with weird colored eyes and the voice of some dead lady. Pretty cool episode!