Citation Hunt

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In page List of Star Trek: The Original Series episodes:

"

The show's 26-episode second season began in September 1967^[1] with "Amok Time", which introduced actor Walter Koenig as Russian navigator Pavel Chekov, and granted viewers the first glimpse of Spock's homeworld, Vulcan. The season also includes such notable episodes as "Mirror, Mirror", which introduces the evil "mirror universe"; "Journey to Babel", featuring the introduction of Spock's parents Sarek and Amanda; and the light-hearted "The Trouble with Tribbles", which would later be revisited in a 1973 episode of Star Trek: The Animated Series and a 1996 episode of Star Trek: Deep Space Nine. The season ended with "Assignment: Earth", an attempt to launch a spin-off television series set in the 1960s.^{[citation needed]}

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