Star Trek: The Original Series, season 1, episode 14
The Menagerie
Summary
Part I: Spock hijacks the Enterprise to take his crippled former captain, Christopher Pike, to the forbidden world of Talos IV. He then demands a court martial, where he uses the events of "The Cage" to tell the tale of Pike's captivity on the planet years earlier.Part II: After witnessing the Talosians' capabilities of mental illusion, Kirk realizes that Spock intends to return Pike to the planet to live a life of illusion, unencumbered by his crippled condition.
Summary from Wikipedia, CC BY-SA 4.0.
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