In the mirror universe, Michael DeSalle was a Terran male in the service of the Imperial Starfleet of the Terran Empire during the 23rd century. In the 2260s, he served aboard the ISS Enterprise. In 2267, DeSalle became the ship's chief engineer as his predecessor Montgomery Scott was promoted to first officer following Spock's assassination of Captain James T. Kirk. Scott was never very happy as executive officer, feeling that he left engineering in less capable hands, often times supervising work in engineering from the bridge.