Commander T'Uerell was a Vulcan scientist who lived during the mid-22nd century. She would change from a simple researcher for the Vulcan High Command into one of the biggest threat to the Federation since before its foundation. (ST video game: Legacy)
She would be sent on a scientific mission on board her starship, the Seleya where she would engage her research as a "Seeker of Past Truth." She would disappear from sometime after which the Vulcan government would ask Starfleet to send starships to uncover T'Uerell's fate and return her back to Vulcan. This was because her government did not believe in her research and two vessels would be sent to find her; one of which was the Enterprise (NX-01) under the command of Captain Jonathan Archer.T'Uerell's ship would be found behind a dead moon where it was besieged by Romulan warships which were eventually fought off. She would reveal aspects of her research and purpose with Captain Archer before heading back to one of her outposts when she convinced him that her research team may have been under threat by more Romulan attackers. When T'Uerell and Archer went to the station, it was under attack. At the end of the battle, the station was destroyed with innocents still onboard. Despite being furious with these turn of events, Archer continued his campaign against the Romulans. When the Romulans attacked Earth, he commented that he believed that T'Uerell was involved.(ST video game: Legacy)
In 2270, Captain James T. Kirk and the USS Enterprise, along with a Starfleet task force head deep into Klingon space to capture an experimental vessel, a Klingon Bird-of-Prey. After Kirk is able to capture the ship with a tractor beam, Kirk infiltrates Klingon space and finds T'Uerell scheming with the Klingons to once again destroy the Federation with a Klingon beam weapon. The weapon is destroyed, but T'Uerell flees again, much to Kirk's ire. Two years later, in 2272, Admiral Kirk and the crew of the Enterprise thwart T'Uerell's plan to conquer the Federation, and learn that she is working with strange cybernetic creatures that are assimilating Klingon vessels. Many ships are destroyed in the resulting conflict. During the attack, thousands of Omega particles destroy subspace in a three light year distance. Kirk asks Starfleet to develop the Omega Directive. Kirk is disappointed that he did not defeat T'Uerell and concludes his quest.
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In 2380, T'Uerell would have a confrontation once against with Captain Jean-Luc Picard of the USS Enterprise-E along with Admiral Kathryn Janeway of the USS Voyager. At this point, her once Vulcan starship would be covered with advanced Borg technology making her much more dangerous. After she encounters the two, T'Uerell reveals her plans to conquer the Alpha quadrant through the use of Borg technology in order to impose a new age of peace in the galaxy. Attempts would be made to convince her otherwise but would fail. T'Uerell would then depart from her meeting in order to summon her Borg strain for assimilation of Federation colonies. This would begin with an assault by Borg cubes on Bajor and Deep Space 9.What T'Uerell did not expect however was the resistance she would face when Klingons and Romulans would join the Federation fleet against her forces. Her invasion fleet would be defeated but T'Uerell's vessel would manage to escape but her enemies would be in pursuit.T'Uerell would flee to a star system with numerous Borg vessels under her command but came under attack by a combined Federation, Klingon and Romulan task force which was led by the Enterprise-E. After her escorts were destroyed, T'Uerell's own ship came under attack and was unable to survive the countless strikes made against her vessel which was eventually destroyed and ended her menace in the Alpha and Beta quadrant. During her final moments, T'Uerell attempted to contact Captain Picard but whether it was the Borg or Vulcan persona within her was unknown.A search was conducted by Starfleet of the remains of her ship but failed to detect the lone Vinculum of T'Uerell's ship that remained and powered up. (ST video game: Legacy)
T'Uerell was determined to use the power of the Borg to create a force for logic and order in the galaxy. In order to accomplish this, she attempted to bide her time until she could finally take control of the Collective itself in order to enforce her views on a chaotic quadrant. She used the Vulcan axiom of "the needs of the many outweigh the needs of the few."