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"...barely a sex life and no imagination, but he knew phase coil inverters like no one else."
Jadzia Dax, 2370[src]

Tobin Dax was a joined Trill in the 22nd century. Born Tobin Fendus, he was the second host of the Dax symbiont, becoming Tobin Dax. He was a skilled engineer, though shy and introverted.


Tobin was known to be an expert on sub-impulse thrusters and phase coil inverters. (DS9 episode: "The Siege")

In the mid-22nd century, Tobin Dax was recruited by the Cochrane Institute of Alpha Centauri to participate in the testing of a prototype transporter. (DS9 - The Lives of Dax short story: "Dead Man's Hand")

In 2154, Tobin was at the launch of the Columbia NX-02 and had calibrated the warp coils. (ST - Destiny novel: Gods of Night)

In 2155, Tobin was part of Earth's Warp Seven Stardrive Program alongside Skon and Pell Underhill. (ENT - The Romulan War novel: Beneath the Raptor's Wing)

In 2157, Dax, Underhill, and Skon were present at a failed test of countermeasures to the Romulan remote-hijack system. Dax and Underhill participated in a successful test later that day after Skon had been removed for being a security risk. (ENT - The Romulan War novel: To Brave the Storm)

Following the war Dax worked on several conceptual designs for what unified Starfleet vessels would look like. Dax felt that Earth's starship designs were the most logical for a fleet of exploration, and believed that even with the combined technologies of the Federation members the ships would look largely like United Earth Starfleet ships such as the NX-class, Columbia-class or the Intrepid-class.

In 2163, Dax requested a posting on the USS Pioneer after he was asked to consult with the chief engineer following the installation of an upgraded warp core, one capable of sending the Intrepid-class up to warp 5.6. He was assigned as chief engineer after Alan Sheehan was forced to undertake a leave of absence for medical reasons.

While on the Pioneer, Dax' joined nature was discovered by the ship's chief medical officer, Doctor Therese Liao. At the time the joined nature of the Trill was not widely known, and Liao respected Dax's wishes to keep that nature a secret. She did suggest to Dax that he confide in Captain Reed, which he eventually did. Reed also kept Dax's nature secret. (ENT - Rise of the Federation novel: A Choice of Futures)

In 2165, the Ware attacked the Pioneer, severely damaging her. His assistant chief engineer, Lieutenant Prentis Morrow, died in the encounter, which reminded Dax how dangerous space travel can be, and he decided to leave Pioneer. He visited his friends, Skon and T'Rama, on Vulcan, who invited him to stay in their home as a guest, until he decided what he wanted to do next.

While on Vulcan, Tobin met Iloja of Prim, the exiled Cardassian poet who was living on the planet at the time. During his stay, Tobin often visited debate houses with his friends, including Iloja and Phlox. He followed the events of the unfolding political situation following the claim that the Kir'Shara was a forgery created in the previous decade by then Captain Jonathan Archer and the United Earth Starfleet to overthrow the Vulcan High Command. He was also instrumental in preventing the destruction of Vulcan Space Central by discovering the sabotage of the docked USS Endeavour's warp engine. After the crisis was resolved, and having spent much time with Skon and T'Rama who just had their child, Sarek, he decided to build a family of his own. (ENT - Rise of the Federation novel: Uncertain Logic)

As an elderly man, Tobin participated in a plasma research project for a power facility. (DS9 novel: The Tempest)

Personal life

Although shy, Tobin enjoyed magic tricks. During the Earth-Romulan War, he demonstrated his abilities to Skon, who was not particularly impressed. (DS9 - The Lives of Dax short story: "Dead Man's Hand")

However, Dax and Skon eventually became good friends. (ENT - The Romulan War novel: To Brave the Storm, ENT - Rise of the Federation novel: A Choice of Futures)

Tobin started a family sometime after 2165. His child Raifi was known to have put him "through hell." (ENT - Rise of the Federation novel: A Choice of Futures; DS9 episode: "Nor the Battle to the Strong")

During his life, Tobin worked on a proof of Pierre de Fermat's theorem. (DS9 episode: "Facets")

Tobin was known to be the only host of Dax (up to and including Jadzia) to have attempted growing plants, although he was not always successful. (DS9 episode: "The Wire")

Tobin was a vegetarian. (DS9 episode: "Afterimage")

According to Curzon, Tobin was never intoxicated in his life - until Curzon undertook the zhian'tara ritual and got Tobin drunk. (DS9 episode: "Facets")

In 2371, Miles O'Brien embodied Tobin during Jadzia's zhian'tara. He was pleased to learn Jadzia admired his work on Fermat's theorem. (DS9 episode: "Facets")

Alternate timeline

Tobin was an engineer in the Interstellar Coalition. A later host in this timeline was Tornellen Dax. (ST - Myriad Universes novel: The Tears of Eridanus)


hosts of the Dax symbiont
primary universe Lela YuraniEnjana* • Penzak* • Tobin FendusEmony OdarenDax (Ensign)* • AudridToriasJoran BelarCurzon AntraniJadzia IdarisVerad Kalon* • Ezri TiganDax (Enterprise-J captain) Trill icon image. Symbiosis Commission icon image.
First Splinter timeline Jadzia IdarisEzri Tigan
other alternate timelines Jadzia IdarisEzri TiganTornellenYedrin
mirror universe Curzon AntraniJadzia IdarisEzri Tigan
Preceded by:
Dax' Hosts
Succeeded by:










External link