Star Trek Expanded Universe

Seifer (symbiont)

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For additional uses of "Seifer", see: Seifer.

The Seifer symbiont was a genetically altered Trill symbiont, a symbiotic life-form that existed with the Lex host and then the Night host as a joined species. Each joining of Seifer with a host created a new, unique individual, but each individual also carried the memories of the previous hosts. (Star Trek: Phoenix-X)


In 2377, the Lex host desired and acted to remove Seifer symbiont from her body and force it into the Night host, so that she could have the Gotens symbiont. ("Secret Shuttles, Part I")

In 2379, the Gordarions kidnapped Commander Night Seifer and experimented on the symbiont. Removed from the host, the symbiont gained a mouth and a minor suggestion of appendages. When the crew of the USS Phoenix-X saved both the host and symbiont from Gordarion captivity, the Seifer symbiont began giving orders to the crew. In no time, the symbiont had taken its place upon the Captain's chair and attempted to command the ship during the Gordarion crisis. Doctor Lox then reacquired the symbiont and began surgery. The symbiont was soon returned to the Night host. ("Occurrence, Part I & II")

Because the symbiont's genetic alterations took place in close proximity to a Rift that radiated quantum disturbances, the symbiont's ability to become self-conscious became only possible under abnormal quantum circumstances. This was not limited to the Mirror universe.

In 2382, when the Phoenix-X was brought into the Mirror universe, the Seifer symbiont became self-sustaining once again, and literally burst out of the Night host. After an escape, and a quick mending to the Night host by Doctor Lox, the Seifer symbiont was free yet again run a muck. This time, the Seifer symbiont used the crew's at-the-time-capture to his advantage and attempted to sell the crew to the Klingon-Cardassian Alliance in exchange for his own command. His efforts were quickly thwarted by the crew, and the symbiont was returned to the Night host after the return to the original universe. ("Mirrorlyness!")

In 2384, Lox and Seifer took a trip to Moab IV, where Seifer underwent extensive genetic surgery to reverse the effects of his symbiont coming back to its own sentience. The procedures were ultimately successful. ("Remnants")

In 2386, during a trip to the Delta Quadrant, the Phoenix-X was infiltrated by medical experimenting Srivani. The lead scientist performed a special experiment on Seifer, which genetically altered his symbiont, bringing it to life. These alterations included a growth of eyes, mouth and stubby arms. After abandoning its host body with aspirations of command, the symbiont eventually found it stood no chance against a reptile threat from planet Iota Geminorum IV. The symbiont was then convinced to return to his host body, as before. ("Triple Tribble Sunday")


The Seifer symbiont is constantly obsessed with power. It would attempt to gain it any way possible, even if the means were immoral or illegal. This closeness to negating the law is somewhat evident during the joining with its hosts, as both the Lex host and the Night host regularly didn't hesitate to work against the law. ("Secret Shuttles, Part I")

By the time the Seifer symbiont reached the Oroku host, its power-obsessed, law-breaking influence had been cancelled out by Oroku's personality. ("Nightmare Anomaly")


See alsoEdit

Background informationEdit

  • During the episode "Occurrence, Part II" the symbiont's name was written as -Symbiont-, and during the episode "Mirrorlyness!" it was simply Sym. In both cases, the name should have technically been Seifer, but Seifer was used as the Night host's name - despite the fact that the Seifer symbiont was separated from the Night host. In "Triple Tribble Sunday", it was shortened to Seif.

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