"Reunion" is the 81st episode of the science fiction television series Star Trek: The Next Generation. The seventh episode of the fourth season.
In this installment of the series, the Captain of the Federation Starfleet starship USS Enterprise Jean-Luc Picard is called on to arbitrate a power struggle over the leadership of the Klingon Empire, while the ship's Chief of Security Lieutenant Worf is shocked to discover he has a son.
The Enterprise is met by a Klingon Vor'cha class battlecruiser, and Ambassador K'Ehleyr requests to come aboard the Enterprise to speak to Captain Picard on an "urgent matter". When she transports aboard, she also brings along a young Klingon boy; based on his previous romantic experience with K'Ehleyr, Lt. Worf suspects the child is his son. K'Ehleyr warns the senior staff of a power struggle occurring within the Klingon Empire, and implores Picard to meet Chancellor K'mpec aboard the battlecruiser. On the Klingon ship, K'mpec acknowledges that he has been poisoned and is slowly dying, and insists that Picard become the Arbiter of Succession and also identify his assassin. K'mpec dies shortly afterward, and the two challengers for leadership of the council, Gowron and Duras, arrive for the Rites of Succession. Worf still harbors hatred for Duras who had (falsely) revealed Worf's father, Mogh, as a traitor in the Khitomer massacre and stained Worf's family name.
Both Gowron and Duras attempt to quickly bring the proceeding to an end, but a small explosion erupts in the assembly hall. Both Picard and K'Ehleyr are safe, but decide to draw out the Rites using an archaic long ceremony while the Enterprise crew perform forensic analysis on the explosion. Though both resent the longer form, Gowron and Duras agree to continue the Rites. Meanwhile, K'Ehleyr has confirmed to Worf that the Klingon boy is his son, Alexander, and did not tell Worf for fear he would try to have a deeper relationship with her; Worf fears for Alexander's future given the stigma of his family name.
The Enterprise crew discover the explosion to have come from a Romulan bomb worn by one of Duras's guards. K'Ehelyr, aboard the Enterprise, begins to access the Klingon records and comes across evidence of Duras' father being the true traitor in the Khitomer massacre. Duras, notified of K'Ehelyr access to the records, transports aboard the Enterprise and kills her. Worf later discovers her body, and transports to Duras' ship, challenging Duras to the Right of Vengeance, a battle to the death. Worf is victorious and kills Duras. Without a challenger, Gowron is made Chancellor.
After the Klingons have left, Picard takes Worf to task for killing Duras. Though Worf defends his actions as valid under Klingon law (the High Council considers the matter closed), Picard reminds him he is a Starfleet officer and bound by its code of conduct, and places a formal reprimand on Worf's record. Worf and Alexander mourn their loss, and Worf places the boy in the care of his own adoptive parents, Sergey and Helena Rozhenko.
- This episode marks the first writing credit for Brannon Braga who did a rewrite of this episode as an intern.