Worf was a Klingon male who lived during the late 23rd and early 24th centuries. He was the head of the noble House of Mogh, the elder brother of Thok Mak, the father of Mogh, the paternal grandfather of Worf and Kurn and the paternal great-grandfather of Alexander Rozhenko. (TOS movie: Star Trek VI: The Undiscovered Country; TLE novel: The Art of the Impossible; ST video game: Klingon Academy)