Episode Title: "ELAAN OF TROYIUS"
Production Number: 57
Original Air Date: 12-20-68
The United Space Ship Enterprise enters the disputed Tellun star system -- near the Klingon border -- on a top-secret diplomatic mission, and picks up Ambassador Petri of the outer planet, Troyius, and approaches the inner planet, Elas, to pick up Elaan, the Dohlman of Elas.
The Troyian ambassador tells Captain Kirk that the Dohlman of Elas is to be the wife of the Troyian ruler to bring peace to the two warring planets, now that they have the capability to destroy one another. Ambassador Petri must teach the disagreeable Elaan to be civilized before they reach Troyius. After the impetuous Dohlman stabs Ambassador Petri, Kirk takes it upon himself to indoctrinate her to Troyian customs and manners.
En route to Troyius, the Enterprise crew detects a Klingon war ship following them. One of the Dohlman's guards is found in Engineering transmitting a signal to the Klingon ship and sabotaging the warp drive.
Spock learns that the Dohlman's jewels are made of dilithium crystals -- common stones on her planet, but very valuable to the Klingon Empire and the Federation. The Enterprise uses the crystals to restore its engines before the Klingons attack, and is able to complete its mission to deliver Elaan and Petri to Troyius for the arranged marriage.
Factoid: Elasian ships use primitive nuclear propulsion units.
Factoid: The tears of Elasian women act as a powerful love potion.
Factoid: On Elas, dilithium crystals are common stones known as radans, worn as jewels in a necklace to bring the wearer luck.
Guest Characters: Nurse Christine Chapel, Lt. Leslie
Alien Races: *Elasians, *Troyian, Klingons
KEY: [brackets]=illusions *star=first appearance