In the mirror universe, Gejh was a Klingon warrior who lived during the 23rd century.

In 2282, he and K'mdek accompanied General Kor to Cestus III to meet a Ferengi black marketeer named Lorp in order to obtain information regarding a top secret project being run by the Imperial Starfleet aboard the supposedly abandoned Regula 1 Space Laboratory at the edge of the Mutara Nebula. Lorp's payment was a complete set of holographic schematics of a cloaking device. However, after Kor reviewed the data, Gejh and K'mdek killed Lorp and his two henchmen using their disruptors. (TOS - Mirror Universe novel: The Sorrows of Empire)

It is unknown if Gejh has a counterpart in the primary universe.
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