Here are the Origin episodes of the most significant characters from the Star Trek: The Original Series introduced by Rod Roddenberry, son of Star Trek creator Gene Rodenberry: The Cage: the pilot that started it all and introduced Captain Pike and Spock. Where No Man Has Gone Before: the first time Captain Kirk is seen at the helm of the Enterprise. Space Seed: the debut of super villain, Khan. Errand of Mercy: the crew's first encounter with the barbaric Klingons. Trouble with Tribbles: the arrival of the cute, but catastrophic creatures.