T ' Pol ( mirror ) Commander T ' Pol was a female Vulcan science officer in the 22nd century Terran Empire . In the 2150s , she served aboard the . Biography . During her " pon farr " cycle , T ' Pol had do her a " favor " that he enjoyed doing several times . T ' Pol resented being thought of as a slave , and often voiced her opinion on matters , whether she had been asked to do so or not . When Commander mutinied against Captain Maximilian Forrest in 2155 , Archer appointed T ' Pol as his first officer , even though Major was next in line under the ship ' s chain of command . Although he was prejudiced against Vulcan s , Archer respected her abilities as an officer and scientist , and believed ( incorrectly ) that he had her loyalty . T ' Pol and other Vulcans secretly formed a counter - mutiny against Archer to put Forrest back in command of the ship . To assist in returning control of the " Enterprise " to Captain Forrest , T ' Pol tempted Tucker with a sex ual encounter so that she could mind meld with him , planting a mental suggestion to sabotage the cloaking device on " Enterprise " , and then had his memories altered . When Commander Archer later briefed the senior crew regarding a ship the Tholian s had obtained from the future of the prime universe , and his plan to seize it , T ' Pol was skeptical and objected to the plan . Forrest overruled her objections and proceeded with the mission . When Forrest ordered Archer to take an assault team aboard the , he pulled T ' Pol aside and secretly ordered her to kill Archer during the mission . T ' Pol never got a chance to carry out the order . While the assault team was on board the " Defiant " , the " Enterprise " was attacked and destroyed by Tholian vessels . ( ) T ' Pol subsequently helped Archer and the assault team to power up the " Defiant " , escape the Tholian base and destroy . After the " Enterprise " s escape pod s were collected by the " Defiant " , there was a crew complement of only forty seven , not nearly enough to run a vessel on a long term basis . Furthermore , the ship was not fully operational in that the ship ' s warp drive was off - line . In desperate need of her scientific expertise , Archer appointed T ' Pol as his second - in - command . He made it perfectly clear to her , however , that he bitterly resented her betraying him to Forrest , and that he would order her execution were it not for the fact that no other officer was qualified to replace her while " Defiant " was only partially operational . Archer contemptuously dismissed T ' Pol ' s argument that it was her duty to stop him , since his orders to relieve Capt . Forrest were fraudulent . He icily told her that he felt the Vulcans were responsible for the rebellion against the Terran Empire , and gave her dire warnings as to what would happen to her should she betray him a second time . T ' Pol studied the " Defiant " s historical database and learned of the United Federation of Planets that was eventually formed in its universe . She was intrigued by the fact that it was an alliance of several alien races , all of whom were regarded as equals . T ' Pol became alarmed when Archer killed Admiral Black and announced his intention to return to Earth , overthrow the Emperor and take the throne for himself . She feared that many Vulcans would be killed under his reign , as he blamed them for the rebellion . She enlisted the help of , a Vulcan crewman on board the , and downloaded the " Defiant " s tactical information to him before Archer had her and all other alien crew members transferred off " Defiant " to the " Avenger " . Both T ' Pol and Soval convinced to sabotage the " Defiant " so the " Avenger " could destroy it . Before this was done , however , communications officer discovered the information T ' Pol downloaded from the " Defiant " and arrested T ' Pol on the " Avenger " after fierce hand - to - hand combat . T ' Pol was interrogated by Archer and Sato , but despite their best efforts , they failed to get any information out of her . T ' Pol defiantly warned Archer that although it may take centuries , Humanity would ultimately pay for its arrogance . Sato , who hated T ' Pol , was adamant that Archer execute her for her treachery immediately . Before the execution could be carried out , however , the " Defiant " s power systems began to fail and the ship was attacked by the " Avenger " . ( ) Appendices . Background information . Like her counterpart , T ' Pol was portrayed by Jolene Blalock . In the final draft script of " In a Mirror , Darkly " , T ' Pol was described thus ; " " Her hair is [ . . . ] longer , more Human in appearance . This T ' Pol is far more harsh and fiercely logical than the Vulcan we know – she views emotion as a weakness . " " It was unclear what happened to T ' Pol at the end of the episode . However , it is reasonable to assume that both she and any remaining mutineers were likely executed , if not on Archer ' s orders , then on the orders of Empress Sato . T ' Pol ' s prediction to Archer regarding the Terran Empire ' s downfall proved to be prophetic . By the 24th century in the mirror universe , the Terran Empire was destroyed by the Klingon - Cardassian Alliance , and most Terrans were enslaved .