In the mirror universe, Morowski was an Imperial Starfleet officer during the 22nd century. In 2165, Morowski replaced Charles Tucker as the chief engineer of the USS Defiant. Tucker requested that he be sent back to the Defiant, saying Morowski was good, but not as good as he was. (ENT - Mirror Universe short story: "Nobunaga") It is unknown whether or not Morowski had a counterpart in the primary universe.