I have no idea what it is, but I have a contender:
“Outer Limits” (original series) episode “Wolf 359.”
I don’t know the exact air date, but it was mid 60s.
My Mother was a the lecture at the Royal Society in London when Crick and Watson(?) presented their research and anounced the discovery of DNA. My Great-Aunt, who was a member, met my Mother for lunch and told her to come along pay attention as it “would be interesting”.
This however has nothing to do with the topic, but nevermind.