Vulcan scientist and mother of T'Pol, a secret Syrrannite who died in the High Command's attack on the movement's sanctuary.
T'Les was the mother of T'Pol and a member of the Vulcan Science Academy. Played by Joanna Cassidy, she appears in Home, having resigned from the Academy as an indirect punishment for T'Pol's actions at the P'Jem sanctuary. To restore her mother's standing, T'Pol agreed to marry Koss.
T'Les was secretly a Syrrannite, and in Awakening, T'Pol found her among the dissidents in the Forge. When V'Las's forces bombarded the Syrrannite sanctuary, T'Les stayed behind out of concern for her daughter, was wounded, and died in T'Pol's arms.