• Leonard Nimoy played an alien in Zombies of the Stratosphere. Gene Roddenberry personally invited Nimoy to play Spock, but I'm still going to say it was a coincidence.
• Susan Oliver was in an episode of The Twilight Zone with similarities to "The Cage," and in a similar role. She might have come to mind for that reason, but in any case she was fantastic as Vina. She had a haunted quality.
• From Chapter Nine of The Trouble with Tribbles (1973):
"The Trader was a fellow named Guy Raymond—he’d been doing some beer commercials as a bemused bartender while crazy things happened in his bar. So he was perfect for the Trader." That one was deliberate.
I'm pretty sure there are more examples.
• Susan Oliver was in an episode of The Twilight Zone with similarities to "The Cage," and in a similar role. She might have come to mind for that reason, but in any case she was fantastic as Vina. She had a haunted quality.
• From Chapter Nine of The Trouble with Tribbles (1973):
"The Trader was a fellow named Guy Raymond—he’d been doing some beer commercials as a bemused bartender while crazy things happened in his bar. So he was perfect for the Trader." That one was deliberate.
I'm pretty sure there are more examples.
