I really need to purchase this series. There are so many episodes I haven't seen in nearly twenty years, so I'm really unqualified to speak of them right now.
When you folks speak of the 'quiet horrors' of space, I agree enthusiastically. One of the things I really liked about the first season of Space:1999
is that they were able to convey very scary moods with little more than a few words, or just a weird event, which would plant in my mind really creepy, unsettling feelings. I looked forward to the scariness of it all, minus depressing morbidity. As you say, psychological terror is the worst of all...yet in cases like these it's really the best