There's something charming about this abstract mystery episode. It ingeniously uses the holodeck as a metaphor to tell its story about an emerging intelligence, allowing several guest stars to play metaphorical aspects of the ship. (The best of these is David Huddleston, who shines as the train conductor.) In addition, the episode is a true ensemble piece, allowing each main cast member to contribute to the story. And while it's a bit sad that the profound idea of the ship becoming sentient is used almost as a throwaway idea that's simply there to propel us into the train adventure, maybe many years from now there will be a new Star Trek series that takes place on the sentient offspring of the Enterprise, turning this episode from an enigma into an astoundingly visionary setup. For now it's just a weird one; but in a good way.
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