<P> In the fourth season, Michael Dorn joins the cast of Deep Space Nine as the Klingon character Worf . Perhaps because of her past interactions with Klingons, Dax is fairly flirtatious with Worf . Worf appears at first to be oblivious to this attention, and in the fifth - season episode "Looking for par'Mach in All the Wrong Places" he becomes enamored with a female Klingon named Grilka . This is resolved by the end of the episode, with Quark ironically winning the heart of Grilka, and Worf becoming romantically involved with Dax . </P> <P> In the beginning, their relationship is very sexual, with the strong implication that their encounters are somewhat rough (the above episode ends with Worf and Dax visiting the infirmary with various bruises and other injuries). In the season 5 finale "Call to Arms", the station is overrun by Dominion forces, and Dax and Worf are assigned to different starships for the Dominion War . Near the end of the episode, they agree to get married after the war is over . Worf and Dax's marriage is the centerpiece of season 6 episode "You Are Cordially Invited ...". During the episode, Dax must obtain permission from the lady Sirella to join the House of Martok . At first Dax is loath to pay Sirella the required respect, and the lady is unwilling to accede to Dax's request . The situation is resolved by the conclusion, with Sirella admitting during the ceremony that nothing can stand between "the beating of two Klingon hearts". </P> <P> Jadzia is murdered in "Tears of the Prophets", the finale of the sixth season . She and Worf had been trying to conceive, despite the doubts of Dr. Bashir that such a pregnancy was possible . After Major Kira tells Jadzia she has been praying for a conception, Jadzia receives encouraging test results from Julian, and goes to the station's temple to thank the Prophets . It now appears a pregnancy will be possible . The Cardassian Dukat arrives, possessed by a Pah - wraith, with the intention of destroying the orb - like Bajoran artifacts known as the "Tears of the Prophets". Jadzia is no match for Dukat while he is infused with the Pah - wraith . He mortally wounds her and destroys the orbs . Upon her death in the infirmary, a distraught Worf screams out a Klingon wail of sorrow for his beloved and to let the Klingon afterworld know a warrior was on the way ("Heart of Glory"). Her death shakes the crew to its core: by the beginning of season 7, Sisko has left the station in despair and Worf has been risking his life on increasingly dangerous missions . </P> <P> Though the host Jadzia is dead, the symbiont Dax survives and is implanted in a Trill named Ezri Tigan . The resulting joined Trill, Ezri Dax, becomes a main character during the seventh and last season of the series . </P>

What episode of deep space nine does dax die