Jadzia Dax's connection to the Klingon culture became increasingly important as the series progressed, especially after the fourth-season arrival of Worf. In the episode "The Sword of Kahless", Dax joins Worf and Kor in the search for the titular Klingon artifact. In "Sons of Mogh", she becomes aware of and subsequently warns Captain Sisko of Worf's attempt to kill his brother Kurn, and in "Soldiers of the Empire", Worf and she go on a tense mission aboard a Klingon ship. Jadzia Dax eventually married Worf and joined him as a member of the Klingon House of Martok.