For the primary universe counterpart, see Harold Morrow.

In the mirror universe, Thomas Morrow was a Terran admiral in the Imperial Starfleet of the Terran Empire during the late 23rd century. Morrow was part of a conspiracy with other high ranking Imperial Starfleet officers to assassinate Emperor Spock. The plot failed and Morrow, along with the other conspirators, was executed. His role in the conspiracy was discovered when his accomplice General Quiniven was exposed using a captured Klingon mind-sifter. He and his fellow conspirators, including Admirals Lance Cartwright and Robert Bennett, Colonel Ivan West and General Salliserra zh'Ferro, were executed. (TOS - Mirror Universe novel: The Sorrows of Empire)