I loved this too! I was a KID when it first aired, but have always been haunted by the images in that "Concrete Captain" episode. Truly creepy. I just found out the name of the series yesterday - I couldn't remember it for the last 32 years - and it brings back memories. I remember Jodie Foster in one, with an old actor whom I cannot remember; and another episode where there's something moving around in the well in the cellar of a house. Great stuff. They just don't show this stuff on TV anymore; episodic TV like this is thought not to work, and the 70's allowed for more downbeat endings that didn't necessarily need to be ironic. Wish someone would give us a scary series again soon. BUFFY was neat, but not scary.
Oh, yeah - I always thought Sebastian Cabot was perfectly cast. He was quite creepy! Loved him as Satan in THE EVIL.