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"…barely a sex life and no imagination, but he knew phase coil inverters like no one else."
– Jadzia Dax, 2370 ("The Siege")

Tobin Dax was a joined Trill and the second host of the Dax symbiont. (DS9: "The Siege", "Invasive Procedures")

He had an unknown number of children, one of whom was named Raifi, who caused him a number of difficulties over the years. However, Tobin could not bring himself to discipline any of his offspring, no matter what they did. (DS9: "Explorers", "Nor the Battle to the Strong", "Afterimage")

He was a vegetarian and was known to bite his nails. (DS9: "Afterimage", "Facets")

Years later, Jadzia Dax felt that Tobin had a minimal sex life and was unimaginative, but he was a skilled engineer who was known for his intimate knowledge of phase coil inverters. Tobin once tried to learn some botany, but he didn't have much luck at it – he was the only Dax host to try it. (DS9: "The Siege", "The Wire", "The Siege of AR-558")

He also once tried his hand at learning magic tricks. Like most of the other hosts, however, he had no musical talent. (DS9: "Equilibrium", "Rejoined")

One of his hobbies was developing an alternative proof to Fermat's last theorem. (DS9: "Facets")

Tobin once met the famous Cardassian poet Iloja of Prim while the latter was exiled on Vulcan. (DS9: "Destiny")

During Jadzia Dax's zhian'tara in 2371, Miles O'Brien embodied Tobin's memories and personality. When Curzon Dax undertook the ritual, he got Tobin drunk – for the first time in his existence. (DS9: "Facets")


Background information

Tobin Dax was played by Colm Meaney during Jadzia Dax's zhian'tara in the episode "Facets".

According to the script for "Afterimage", his name was pronounced as "TOE-bin". [1]

In the first draft script of "Afterimage", Tobin was referred to as being allergic to nolaberry.


In Star Trek literature, Tobin Dax lives around the time of the events of Star Trek: Enterprise. Dax appears in the short story "Dead Man's Hand" in The Lives of Dax, in which he and Skon encounter Romulans during the Earth-Romulan War. Tobin has also appeared in Star Trek: Enterprise novels including Beneath the Raptor's Wing, where he is shown to be working on a countermeasure to the Romulans' telepresence technology. Tobin also appears in To Brave the Storm and A Choice of Futures, the latter novel seeing him working with now-Captain Malcolm Reed. In the Star Trek: Destiny novel, Gods of Night it is mentioned that Tobin saw the launch of the NX-02 Columbia.

In the novel Uncertain Logic, Tobin's pre-joining name is given as Tobin Fendus.

Jeffrey Lang saw Tobin as a "nebishy" guy and based his characterization on Woody Allen. Marco Palmieri commented, "That hooked me. Not because I'm a big Woody Allen fan, but because it vividly conveyed a personality type that I wasn't expecting." (Voyages of Imagination, p. 609)

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