While en route to the Federation's galactic library stationed on Memory Alpha, the Enterprise encounters an unusual space anomaly that effects each of the crew members in different ways -- especially Lt. Mira Romaine, who passes out from the experience. That's of particular concern to Chief Engineer Montgomery Scott, who has become so smitten with her that he begins to neglect his responsibilities. Turns out these lights are the last remaining survivors of an ancient race, and they have chosen Lt. Romaine's body to live out the rest of their lives. At this point in its production, "Star Trek" was long past its peak, and with the series on its last legs after a noticeable drop in quality, one would be forgiven for grading these last few remaining episodes on a curve. To that extent, "The Lights of Zetar" represents something of a rebound after the one-two sucker-punch of "Whom Gods Destroy" and "The Mark of Gideon."  The pacing is relatively brisk, the visual effects still hold up after more than 5 decades, and James Doohan gives a commendable performance as love-struck Scotty. "The Lights of Zetar" may suffer from lapses in logic, but it's not all that bad and still qualifies as an entertaining-enough episode of "Star Trek."

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