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A planetoid called Alpha Memory is chosen to become the Federation's official library, and Lieutenant Mira Romaine (Jan Shutan), charged with transferring records to the site's computers, is en route to that destination aboard the
Enterprise. Along the way, she acquires a new beau in the adoring Scotty (James Doohan), and big trouble when the collective consciousness of the Zetars, a lost and disembodied race, attack the Alpha Memory project and take possession of her and her voice.
Not surprisingly, the story was written by someone who knew a lot about projecting personalities and voices into hapless third parties: puppeteer Shari Lewis and her husband Jeremy Torcher, both big fans of Star Trek. Typical of the original series' troubles with ever-shrinking budgets, the Zetar entities are represented as mere colored lights, an adequate effect improved immensely by the scary-dramatic context in which they appear and by a good vocal performance by Barbara Babcock (lately of Dr. Quinn, Medicine Woman) as the merged creatures. Shutan is just fine as the comely librarian, and Doohan is great in his impassioned-Scotty mode. --Tom Keogh
From the Back Cover
Strange-colored light entities take possession of Lt. Mira Romaine, Scotty's new love. If Kirk can't exorcise these Zetarians, they'll kill her and the crew.
TREK TRIVIA
This episode was penned by famous puppeteer Shari Lewis and her husband Jeremy Tarcher, both Star Trek admirers.
Despite shots establishing Sulu at the helm and navigation console, when Kirk returns to the bridge we see Sulu in the captain's chair!