Colonel Worf
Colonel Worf is an attorney/JAG to the Klingon Empire in the fictional Star Trek universe. He was the father of Mogh, and the grandfather of Worf and Kurn. Colonel Worf was portrayed by Michael Dorn, the same actor who portrayed his grandson Worf in the various Trek television series and movies.
He was seen in Star Trek VI: The Undiscovered Country as the defense attorney who was appointed to defend Captain James T. Kirk and Doctor Leonard McCoy against charges of assassinating Chancellor Gorkon. Despite giving his best efforts, Colonel Worf was unsuccessful. Kirk and McCoy were convicted of the charges, and sent to Rura Penthe.
Colonel Worf also participated in the conference at Khitomer. When examining the assassin who tried to kill the Federation President, he realized "this is not Klingon blood." The Starfleet Admiral pulled off the mask, revealing the assassin to be Colonel West.
Colonel Worf made no further appearances in any further movies or television series episodes, although he did have a prominent role in the (non-canon) Trek novel "The Art of the Impossible" in which he had been promoted to the rank of General.