 Lt. (jg) Ezri Dax of Star Trek Deep Space 9 Lieutenant (junior grade) Ezri Dax (played by Nicole de Boer), née Ezri Tigan, is a fictional character in the seventh and final season of the science fiction television series Star Trek: Deep Space Nine.
A Trill Starfleet officer, Ensign Ezri Tigan was assigned to the U.S.S. Destiny as assistant ship's counselor upon leaving Starfleet Academy. She had no interest in becoming joined with a Trill symbiont.
After Lieutenant Commander Jadzia Dax was killed in action aboard Deep Space Nine, the Dax symbiont was saved by Dr. Julian Bashir and sent to Trill aboard the Destiny for re-joining. However, the symbiont became gravely ill during the flight, and as the only Trill on board, Ensign Tigan was asked to join with Dax in order to save its life. Ezri is Dax's eighth official host, but is in reality the tenth, as one host was covered up by the Symbiosis Commission, and another was an unauthorized host that briefly took the symbiont by force.
Upon joining, Ezri was assigned to Deep Space Nine and granted a field promotion to Lieutenant (junior grade). She served as counselor, but also distinguished herself as a science officer (in Jadzia's footsteps) and in combat in the Dominion War.
Jadzia had been married to Commander Worf, who at first refused to even speak to Ezri Dax, convinced that Jadzia Dax had gone on to Stovokor. However the two later became uneasy friends and, briefly, lovers as they considered renewing the relationship Jadzia had enjoyed with Worf (despite it being a major taboo in Trill culture for a symbiont to renew relationships from past lives). Towards the end of the series Ezri Dax began a liaison with Dr. Bashir.
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