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Quotes
Bones: It is a human characteristic to love little animals, especially if they're attractive in some way.
Spock: Doctor, I am well aware of human characteristics. I am frequently inundated by them, but I've trained myself to put up with practically anything.
Bones: Spock, I do not know too much about these little Tribbles yet, but there is one thing that I have discovered.
Spock: What is that, Doctor?
Bones: I like them... better than I like you.
Trivia
Paramount's press releases in 1967 claimed that the Soviet news agency Pravda had complained about Star Trek having no Russian characters, so they were adding Chekov. This story was completely bogus. (Star Trek never aired in the U.S.S.R.) NBC wanted to appeal to the 8-14 teenybopper crowd, and asked Roddenberry to add a character who looked like Davy Jones of the Monkees. So Chekov debuted in season 2, replete with a bad Beatle wig that was, thankfully, soon jettisoned. See more...
Star Trek (1966) - 4 mistakes in "Charlie X"
starring DeForest Kelley, George Takei, James Doohan, Leonard Nimoy, Nichelle Nichols, Walter Koenig, William Shatner (add more)