Trevean was a native of the Gamma Quadrant planet Teplan in the Teplan system which was infected with the Blight by the Jem'Hadar. Trevean, who had lived with the Blight longer than anyone there, had taken on himself the task of easing his people's suffering by giving toxic herbs to those who had 'quickened'. Trevean was played by Michael Sarrazin. His name is an anagram of "veteran". (Star Trek: Deep Space Nine Companion)