In the mirror universe, Seska was an influential Cardassian glinn under the command of Gul Evek on the warship Bak'rikan, which served the Klingon-Cardassian Alliance. During her term of service, she served as Evek's second-in-command, most trusted officer and secret lover. During their illicit relationship, she continuously pumped Evek for information when making love, gaining more insight into the Alliance's workings. Gradually, Seska and other Cardassians started to see the Alliance between their people and the Klingons as a spreading corruption that threatened Cardassia as the Klingons had more power over the Cardassians in government and military strength.