By the way, just a personal opinion is that Star Trek’s first (unaired) pilot “The Cage” was greatly inspired by Lost in Space’s two-part episode “The Keeper,” about a space traveler (long-time Jonathan Harris bud Michael Rennie) who has his own menagerie.
And the “official” pilot “Where No Man Has Gone Before,” reminded me somewhat of the two-part “Outer Limits” episode “The Inheritors.”
Just some opinions. You know there are only seven plots or something like that anyway.
Except that “The Cage” was written and filmed in 1964, Lost in Space didn’t go on the air until September 1965, and the two-part episode “The Keeper” aired in January 1966. Oops!
A more likely inspiration was the Twilight Zone episode “People Are Alike All Over” from 1960. And who was one of the guest stars in that episode? Susan Oliver, four years before she guess starred in “The Cage”.