The Next Generation EYE OF THE BEHOLDER 7x18

Lieutenant Kwan throws himself into a plasma stream in warp nacelle maintenance and is vaporized. It`s up to the crew to figure out why he would do such a thing.

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Soon after Kwan`s death, Counselor Troi begins to have terrifying visions that turn out to be from Utopia Planitia... eight years ago during the construction of the Enterprise-D. Nothing is as it seems and Troi may share Kwan`s fate. This is the first of three `Trek appearances by Mark Rolston.

I summarize the plot and point out and explain all the references so you don’t have to