Tokath was the Romulan in charge of the secret prison camp on Carraya IV, where Klingons captured at Khitomer were sent. When the Romulans decided that the prisoners were no longer useful (they had intended on trading the prisoners back to their people in return for territorial concessions), they were offered release. The Klingon prisoners did not wish to dishonor their families, and asked to be allowed to stay. Tokath sacrificed his career by remaining to hold the Klingons in protective custody. The senior Klingon warrior L'Kor promised that his people would not create a problem for Tokath, and the Klingons and Romulans learned to co-exist peacefully.
Tokath was married to Gi'ral, one of the Klingons in the camp; together, the two had a daughter, Ba'el. Tokath distrusted Worf, and refused to let him leave the encampment, following his intruding in 2369. When Worf and Ba'el became romantically involved, Tokath disapproved. Tokath had enough and ordered Worf that he must accept life in this peaceful society or die.
When Worf refused to cooperate with him, Tokath ordered Worf's execution. When Tokath's own daughter, Ba'el, and other Klingons stand in the front of Worf, Gi'ral has Tokath stop the execution. Tokath let Worf and the other Klingons who wish to start a new life leave encampment, while Worf exacted a promise from these youths to honor their parents by not revealing that their parents were survivors from Khitomer. (TNG: "Birthright, Part II")