Although many good episodes exist in the series 3-year run, "The Lights of Zetar" has long been my favorite. Season 3 has a number of love stories, and while TLOZ may not qualify as Star Trek at it's best, by no means is it Star Trek at its worst. If one can look past flaws in the technical writing of the script, one finds a May-December romance in its most beautiful form between Lt. Cmdr. Montgomery Scott and Lt. Mira Romaine. Scotty is a much-beloved character, and it is both satisfying and fitting that in the series last season he should finally have a love story of his own and with a woman worthy of his heart. I invite you to read more about this episode in http://defendinglightsofzetar.blogspot.com.
Review of The Lights of Zetar
