A Terran Empire admiral whose flagship Avenger is saved by the captured USS Defiant, and who is murdered by the mirror Jonathan Archer when he stands in the way of Archer's ambitions.
Admiral Black appears in the second part of the Enterprise mirror universe story In a Mirror, Darkly, played by Gregory Itzin. He commands the ISS Avenger, with the mirror Soval as his science officer.
Avenger is losing a battle with rebel ships when Archer arrives in the Defiant, a 23rd-century vessel from the prime universe, and destroys the attackers. Black comes aboard, is impressed, and grants Archer a battlefield promotion to captain.
He refuses, however, to give Archer command of the ship, intending to hand it to Starfleet. Archer responds by vaporising him with a phaser and then addresses Avenger's crew, declaring his intention to overthrow the Emperor.