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Kolkorr (also known as Kolkorr the Merciless or Kolkorr of K'Herat) was a 23rd Century Klingon warlord who split from the Empire at some point in the 2260s. He was responsible for an attack on the USS Ackerman that caused significant casualties aboard the vessel.

Though keeping a low profile, Kolkorr is still living and carries a significant grudge against David Whale.

Kolkorr has at least one child - a daughter named Praxa who is frequently used as an undercover operative.