Eye of the Beholder (Star Trek: The Next Generation)

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"Eye of the Beholder" is the 170th episode of the American science fiction television series Star Trek: The Next Generation, the 18th episode of the seventh season. It contains the first depiction in any Star Trek TV series or films of the inside of a starship's warp nacelle, and the only one until 2002's Star Trek: Enterprise episode "The Catwalk".

Set in the 24th century, the series follows the adventures of the Starfleet crew of the Federation starship Enterprise-D. In this episode, Troi investigates a crewman's suicide and discovers that a murder was committed on the ship while it was being built, and that the murderer is still aboard.