In the mirror universe, Trepar was a Cardassian gul in the Klingon-Cardassian Alliance. In 2371, he ordered a retreat of Alliance forces from a battle with the Borg near Rura Penthe. All Cardassian and Bajoran forces, including Trepar's warship, fled the battle, but the Klingons remained, unwilling to abandon territory so close to their homeworld. This retreat may have led to consequences for Trepar after the Borg were destroyed. (TNG novella: The Worst of Both Worlds)