For the regular universe counterpart, see Klag, son of M'Raq.

In the mirror universe, Klag, son of M'Raq was a Klingon male who served the Alliance. In the 2370s, Klag held the rank of captain and served as commanding officer of the Regent-class warship, IKS Gorkon.

By early 2377 the Gorkon was detached to Intendant Kira Nerys's fleet. Prior to this time, he had lost his right arm in battle. Along with Gul Akellen Macet, Klag was summoned to meet with the Intendant aboard her flagship, the IKS Negh'Var to discuss strategy for destroying the Terran Rebellion. (DS9 novel: Warpath)

Prior to 2377, he had lost his right arm in battle. He defeated Martok in honourable combat and thereby succeeded him as Regent of the Alliance in 2377. (ST novel: Rise Like Lions)