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Kirk's command ability is threatened when he falls victim to an alien woman's magical charms in this episode from the third season of the 1960s science fiction television series. The Enterprise is assigned to transport representatives of two warring cultures, Ambassador Petri of Troyius and Elaan of Elas. Petri's mission, with the help of the Enterprise crew, is to tame the primitive and uncontrollable Elaan. This proves to be a difficult task when she lives up to her vicious reputation, enacting violent fits of rage that culminate in the nonfatal stabbing of Petri. Elaan's reckless behavior increasingly frustrates Kirk, until she cries and Kirk unwittingly comes in contact with one of her tears. These tears prove to have mystical powers, causing Kirk to fall madly in love. His sudden obsession with Elaan may be deadly to the Enterprise, however, which comes under attack from a Klingon vessel -- a situation where Kirk's leadership is desperately needed.