"Rules of Engagement" was the 90th episode of the science fiction television series Star Trek: Deep Space Nine, the 18th episode of the fourth season. It was directed by LeVar Burton, and features guest star Ron Canada as a visiting Klingon prosecutor. The episode features special effect sequences with the USS Defiant and the Klingon Bird of Prey spaceships. Set in the 24th century, the series takes place on Deep Space Nine, a fictional space station near the planet Bajor, as the Bajorans recover from a brutal decades-long occupation by the Cardassians. In the fourth season, Cardassia is at war with the Klingon Empire, leading to tensions between the Klingons and the United Federation of Planets. In this episode, Lt. Cdr. Worf, a Klingon who is an officer in the Federation's Starfleet, is charged with destroying a Klingon civilian transport and faces an extradition hearing in which the Klingon Empire seeks to have him tried in Klingon court. Plot Worf commands the Defiant on an escort mission to guard Cardassian medical vessels. While under attack from Klingon raiders, a vessel de-cloaks in front of the Defiant. Expecting the vessel to be a Klingon warship, Worf orders it fired upon immediately without visual confirmation. However, the destroyed ship turns out to be a Klingon civilian transport, and the Klingon Empire wants Worf tried in their court. Admiral T'Lara presides over Worf's extradition hearing aboard Deep Space Nine. Captain Sisko serves as Worf's defense counsel. Ch'Pok, the advocate representing the Klingon Empire, argues that Worf attacked due to uncontrollable bloodlust and was motivated by seeking revenge against the Empire for his family's dishonor, rather than following proper rules of engagement. He calls Worf's friends and acquaintances to testify. Jadzia Dax testifies that, in her experience, Worf is capable of restraining his bloodlust, but that he played a holosuite game before the mission in which he played a warrior who murders civilians. Quark testifies that Worf stated before the mission that he was hoping for an attack. The combat-experienced Chief O'Brien says that he would not have given the order to fire if he had been in command. After Worf testifies that he would never attack an unarmed opponent, Ch'Pok baits Worf into attacking him, contradicting his claim. In the end, Constable Odo's investigation uncovers evidence that the names of all the 441 people who were reported to have died on the transport