Klingon Commander, charming and devious. Obviously has had dealings with Kirk before. We see him deal with James T. Kirk twice, each time ending up with a shipload of tribbles to deal with.But Koloth, a Dahar Master, also was one of the three Klingon commanders having the privilege of knowing the famed Federation diplomat and Starfleet officer, Curzon Dax. The other two were Kor and Kang. Curzon stood godfather to Kor's son--and then a terrorist called The Albino killed him.Koloth, Kor, Kang, and Curzon Dax all swore a blood oath to kill the Albino if they ever managed to track him down. Curzon died before they could fulfill that oath--but Jadzia Dax, who succeeded Curzon as host to the Dax symbiont, agreed to join the three commanders when at last they tracked the Albino to his safe house.