In the mirror universe, Krollage was a Terran male involved in the Terran Rebellion during the 24th century. In the 2340s decade, Krollage served aboard the Lakul under the command of Guinan. He was responsible for beaming an impersonator of Jean-Luc Picard aboard the ship and was later incapacitated as the impersonator escaped. (STA - Mirror Universe short story: "The Traitor") It is unknown whether or not Krollage has a counterpart in the primary universe.