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There is also a story element that the tribes are descended from Earth people. Having crashed and unable to leave, they must start society all over, building lives and villages in the wilderness. This plot borrows heavily from Star Trek, which did a similar thing several times, only a decade earlier. That doesn't make "The Face of Evil" unoriginal, necessarily, but does make it feel familiar for the genre and time period from which it comes.

The humans in "The Face of Evil" are not the men viewers might expect. They were part of a eugenics research project, and some have developed telepathic abilities. This duality, being both more primitive and more advanced than the world where viewers live, makes them a clever curiosity well worth watching.

The villain of "The Face of Evil" is the Doctor, kind of. He creates the personality that controls Xoanon, who is really a computer. It's not a purposeful mistake that the Doctor makes, but it's still at least partially his fault.

The Doctor has never been a perfect being, and this story highlights that again. By making the titular character flawed, and capable of causing great damage without even realizing it, the Doctor becomes an even more shifty hero. Stories like these really enrich the series.Part Lincoln Lawyer, part Requiem for a Dream