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Korgh was the principal antagonist of the Star Trek: Prey novel trilogy, which took place largely in the first splinter timeline established after the events of First Contact.
A Klingon, Korgh was a member of the House of Kruge, and was a protege of Kruge. Kruge had chosen Korgh to succeed him as head of the House of Kruge should something happen to him. During his life, Kruge had been able to keep the simmering tensions in the House under control, but after his death on the Genesis Planet, the tensions boiled over and Korgh was unable to assert his leadership claim over the House of Kruge. Kruge loyalists in the House were ambushed by mercenaries hired by the competing faction in the House, and were defeated in battle. The surviving Kruge loyalists were all discommended and exiled from the Klingon Empire. Korgh only escaped meeting the same fate as no one knew he had been at the battle.
Posing as a man named Galdor, Korgh infiltrated the House and by the 2380s had risen to become the Gin'tak (spear) of the House. Korgh arranged to have the members of the House killed at a ceremony commemorating the Battle of Gamaral, and killed the sole survivor himself. He revealed to the High Council that he was Korgh, and produced faked evidence that Kruge had adopted him as his son over a century earlier. Korgh was then allowed to take control of the House, and was noted for his anti-Federation stance.
Korgh then set an elaborate plan in motion to kidnap and murder Emperor Kahless and take control of the Klingon Empire. He allied with the Unsung, who were descendants of the Kruge loyalists earlier sent into exile as well as a group of con-artists known as the Circle of Jilaan - of which the con-artist who posed as the Ventaxian demigod Ardra was a member of.
Soon, Korgh's elaborate plans began to fall apart when the Unsung captured Worf, Son of Mogh and questioned him over his own discommendation from the Empire to keep Duras from being exposed as the son of a Romulan collaborator. Also the Circle disobeyed Korgh's orders to kill Emperor Kahless, using their technology to make it appear that they killed the Emperor when they had in fact killed the elderly General Potok. In addition to overestimating just how loyal his allies wer to him, he failed to consider the intelligence of his enemies or their own abilities to overcome his plans.
With his former allies turning against him, Korgh was captured and brought before the High Council. Korgh steeled himself for the execution that would soon follow but was surprised to learn that he and only he would face discommendation for his actions, that Worf had talked Chancellor Martok into sparing the innocent family members of the House from being punished for Korgh's crimes. Korgh was discommended and exiled from the Empire, at which point Admiral William Riker stepped in to arrest Korgh for his crimes against Federation citizens. Riker noted that since Korgh had been discommended and exiled he was no longer under the Empire's jurisdiction, leaving the Federation free to pursue criminal charges against Korgh.
In the first splinter timeline, Korgh died in 2387 along with everyone else who existed in that timeline when the Jean-Luc Picard of that timeline initiated a temporal reversion to erase that timeline from existence.