Even though there's a major gaffe - watch the eyepatch while Nielsen is lying in bed - I still find it creepy.
When I was a kid watching this, I thought that was Bradford Dillman as Fritz Weaver's father. What did I know back then? (Little more than I do now, I'm told.)
Anyway, allow me to play Count Floyd for a moment and say Aroooooooo! This is real scary, kids!