Captain Korok was the Klingon commander of a D5-class deuterium tanker during the 2140s and 2150s. For five seasons he harassed a deuterium mining colony, taking the majority of the deuterium and leaving only the bare minimum so the colony could survive. In 2152, the Enterprise NX-01 arrived on the planet to obtain deuterium and became aware of the situation.
When Korok arrived, the deuterium was not ready due to faulty pumps. He became angry and beat Tessic, the head of the miners. He told him that he was not shown the proper respect and gave the miners four days to fill the quota.