Yedrin Dax
Yedrin Dax was a host of the  symbiont in an alternate future timeline created by the starship 's crash landing on Gaia after traveling to the past. He was the great-grandson of Jadzia Dax.

Meeting the crew before the accident, Yedrin proved himself the current Dax host by vaguely mentioning an embarrassing moment is Sisko's past with Curzon. The crew of the Defiant wanted to attempt to get home, which would erase the existence of Gaia. Yedrin said he had a plan to duplicate the Defiant when it reentered the barrier, allowing the original crew to return home while the duplicate crew could fulfill its destiny by crashing on the planet. Jadzia found out that this was a ruse, and that Yedrin was trying to ensure the existence of himself and the rest of Gaia's inhabitants. Yedrin defended his actions by pointing out that he was essentially responsible for the colony's existence, since Jadzia could have warned the Defiant away from the anomaly that originally caused them to land on Gaia, but decided not to due to the possibility of making a scientific discovery. 

His existence was erased when the Defiant avoided the crash and that timeline was averted. Benjamin Sisko and Jadzia initially assumed that Yedrin was the one responsible for their changed flight path when the Defiant missed the anomaly that would have sent them back in time, since only a member of the crew would have possessed the necessary command codes, speculating that he had been unable to go through with the accident again given his prior memories of the crew. Odo later revealed to Major Kira that it was actually the alternate Odo who was responsible. ()

Appendices

Background information 
Yedrin was played by Gary Frank.

The costume worn by Gary Frank as Yedrin was sold off on the It's A Wrap! sale and auction on eBay.  Tags indicate the costume was reused later in Trek.

It is assumed Yedrin will never exist, as Jadzia Dax died before she could have a child.

According to the , the pronunciation for Yedrin was "YEH-drin".

External link 
 

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