Dax was a Trill man, a host of the Dax symbiont and Starfleet ensign.

In the 2260s, Dax was assigned to the USS Constellation. On one mission, Dax was assigned to take a commodore to his court martial, but en route the shuttle Twain crashed on a planet near the Romulan Neutral Zone. When a Romulan ship answered the distress call, Dax tried to pretend the Commodore was a lieutenant, worried Pakel might take him prisoner due to his rank. Pakel allayed Dax's fears, saying he would not take an old man like the Commodore prisoner and hoped trust could be built between the Federation and the Romulan Empire. Ensign Dax quickly came to respect Pakel, a respect Jadzia Dax recalled long after Pakel was dead. (DS9 - Hearts and Minds comic: "Masters of War")

Like Enjana Dax and Penzak Dax, episodes of DS9 like "Facets" and "Trials and Tribble-ations" contradict the existence of this character.

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hosts of the Dax symbiont
primary universe	Lela Yurani • Enjana* • Penzak* • Tobin Fendus • Emony Odaren • Dax (Ensign)* • Audrid • Torias • Joran Belar • Curzon Antrani • Jadzia Idaris • Verad Kalon* • Ezri Tigan • Dax (Enterprise-J captain)
First Splinter timeline	Jadzia Idaris • Ezri Tigan
other alternate timelines	Jadzia Idaris • Ezri Tigan • Tornellen • Yedrin
mirror universe	Curzon Antrani • Jadzia Idaris • Ezri Tigan

Constellation personnel
United Earth, Earth Starfleet	Constellation	Monique Duvall
Federation, Starfleet	USS Constellation (NCC-1017)	Alamanzar • R. Armstrong • M. Decker • Guthrie • G. Howard • Jazayerli • Lawford • H. Litwak • G. Masada • Ponor • L. Rosenhaus • N. Shickele • Sontor • C. Soo • H. Takeshewada • E. Vascogne • I. Vellacora
	USS Constellation II	R. Cross • C. Ikeya • A. MacDougall • Raela hr'Sassish • I. Sasoaka • M. Walsh
	USS Constellation (Kelvin timeline)	Dekker • Lin
mirror universe	ISS Constellation Terran Empire, Starfleet	Matthew Decker • Ponor • Hiromi Takeshewada