YES! Found answer to long curious question: WHEN did I watch Hitchhiker’s Guide to the Galaxy (BBC series) ? I knew I was a kid. I was glued to the TV. But when was it when it got burned into my brain forever?
Well, somebody at INFOCOM – the place where the Zork games were made – scanned hundreds of documents about their “Hitchhiker’s Guide to the Galaxy” text adventure and put it up on Internet Archive.
A Press Release by Douglas Adams told me what I needed. October 30, 1982. I saw every episode including the first. That means I was 10 years old, soon to be 11. That’s why it stuck with me so deeply.