The Enterprise transports Elaan, a member of the ruling dynasty of the warrior Elasians, to the planet of their enemy, the Troyians, so that her arranged marriage will halt their interplanetary war. Kirk must teach the arrogant, vicious princess the ways of polite society but falls victim to the legendary weapon of Elasian women: their tears act as a love potion. Spock tracks what may be another ship shadowing the Enterprise and Kirk, distracted by Elaan, must fight against other parties interested in preventing the Federation's peace efforts. Written by
Did You Know?
When Star Trek: The Next Generation raided the original Star Trek series for story ideas to revamp, "Elaan of Troyius" became "The Perfect Mate" (episode #21 of season #5), where Kamala, also the selected mate for an arranged marriage between two warring planets, selected Captain Picard instead but came to adopt the Enterprise captain's sense of duty and went through with the arranged marriage anyway. See more
(at around 21 mins) When Kirk responds to the intercom hail from Security reporting a disturbance in the Dohlman's quarters, he is clearly located at Spock's science station. Note the audio speaker, tape player, array of five double switches and earpiece. The subsequent mid-conversation wide shot shows Kirk (and Spock) standing at Kirk's command chair. See more
Now listen, Jim. Petri told Christine that the Elasian women have a sort of a biochemical substance in their tears that acts like a super love potion. And according to him, it doesn't wear off.