Zygor was the captain of the ISS Imperia. He was considered a fair man despite the cutthroat nature of the mirror universe. It was generally unknown that Zygor was Vulcan. Due to a social stigma borne by mirror-Vulcans which barred most from positions of power, he had himself surgically altered to appear Terran. He appointed an Iroid named Imirissen as a "troubleshooter" type of security officer aboard the Imperia. (Star Trek: New Empire)