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In the mirror universe, Dorkan is a Cardassian physician in the service of the Klingon-Cardassian Alliance during the 24th century.
In 2371, he ran the infirmary in the Alliance station Elvok Nor under Gul Jasad. His fellow Alliance physician B'Oraq respected him as a colleague. (VOY - Mirror Universe novella: The Mirror-Scaled Serpent)