WARNING: This thread WILL contain unhidden spoilers for this entry. Because this re-watch is in a slightly-subjective chronological order and not in production order, please refrain from talking about the content of other episodes or movies in this thread. If you do, please put that content inside spoiler tags. Some people here may be watching Star Trek for the first time.
#10: Star Trek: The Original Series, season 1, episode 17 "The Squire of Gothos"
Written by Paul Schneider, directed by Don McDougall.
Stardates 2124.5 through 2126.3 (March 2267)
"I object to intellect without discipline. I object to power without constructive purpose." - Commander Spock
In an area of space devoid of star systems, the Enterprise finds a lone planet that shouldn't be there. On that planet is an Earth-like castle, and within in they find a humanoid who calls himself Trelane (William Campbell). Trelane has been watching Earth for a very long time so he is excited to finally meet Earthlings in-person... and he doesn't want them to ever leave.
Originally released: 12 January 1967
"The Squire of Gothos" on Memory Alpha
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What did you think?
Crazy they got the same guy back for an episode of DS9 nearly 30 years later.
For clarification, the same actor plays a Klingon in the original series episode The Trouble with Tribbles, and again in a DS9 episode as a Klingon of the same name. Not Trelane again.