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It is not show exactly when Ensign Chekov joins the crew of the Enterprise during The Original Series.  However, because Khan said "I never forget a face... Mr. Chekov isn't it?"  we can assume it was before the episode Space Seed.  Please see the question Khan & Chekov for further insights on this theory.

The Movie version of Chekov played by Anton Yelchin, came aboard Enterprise at the same time as everyone else.

TrekFan1984 Ends (talk) 01:14, July 10, 2017 (UTC)

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