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So Esperanto is a miserable failure of an idea, but how is Incubus? It's better in a lot of ways. For one, it has the only successful international manufactured language in it- that is, William Shatner. Whether it's because it is in the totally nonsensical fever dream language of Esperanto, or because Shatner hasn't developed his style fully, we can watch a toned down Shatner, who calmly and assuredly delivers honeyed words of poetry for us for the entire duration of the movie.
It's not a particularly interesting story. It's basically a medieval morality play on film, but the atmosphere is other-wordly and the goat that shows up at the end is really creepy. Goats are scary, what can I say. The cinematography is really outstanding as well, with nice shadows and an overall moody presentation. Unlike junky 50s scifi flicks, movies like Incubus really play to the strengths of black and white film making.
If you watch this movie with a bunch of pals you are going to be making Star Trek jokes all throughout at poor Mr. Shatner's expense so I would recommend instead to watch it on a rainy, gloomy morning when you have nothing much going on. Take a trip to Nomen Tuum and you might be surprised at what you find.