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The script, by UCLA librarian and spec writer Jean Lisette Aroeste (who also wrote "Is There in Truth No Beauty?" for the original series), gives the episode a special charge with its dual story lines set in the past. The dramatic weight of the story, however, is clearly with Spock, who regresses into the savage emotions of his prehistoric ancestors--eating meat, choosing another transportee (Mariette Hartley) as a mate, and nearly killing McCoy when the good doctor insults him. This is a favorite among some Trekkers, made all the more enjoyable by the anxious, White Rabbit-like performance of Ian Wolfe as a Sarpeidon librarian in charge of the time-travel facility. --Tom Keogh