Commander T'Pol was the Vulcan science officer aboard the ISS Enterprise. During her pon farr cycle, T'Pol had Trip Tucker do her a "favor" that he enjoyed doing several times. T'Pol resented being thought of as a slave, and would often voice her opinion on matters, whether she had been asked to do so or not. Although he was prejudiced against Vulcans, Archer respected her abilities as an officer and scientist, and believed (incorrectly) that he had her loyalty.
She was killed by her prime counterpart in the Endor War