Star Trek: Voyager, season 7, episode 9
Flesh and Blood, Part I
Summary
After an Away Team stumbles upon a burial ground, Harry Kim is discovered to be missing, having been transferred to the culture's homeworld. The actor playing Vhnoran Dr. Neria, Jerry Hardin played Samuel Clemens (i.e. Mark Twain) in the Star Trek: The Next Generation double episode "Time’s Arrow".
Summary from Wikipedia, CC BY-SA 4.0.
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