Star Trek episode "I, Mudd"

"I, Mudd"
Season 2, episode 8.

The return of the infamous Harry Mudd from the first season, the only returning antagonist of the original series. Heaven knows why. I guess the creators of the show could not have omnipotent enemies every week and decide to throw in a bit of levity every now and then.

Several interesting aspects of this episode include an android named Mr. Norman who easily infiltrates and overtakes the Enterprise. Disgustingly easy.

We find that this world of androids was created by a long-since-gone race from the Andromeda Galaxy. It was also an intriguing solution to defeating the androids.

No one dies in this episode.

Update 7-29-14: I forgot to mention that Mudd even comes back for another episode in Star Trek: The Animated Series. So that's three episodes.