Michael Dorn is an American film, television, and voice actor best known for his role as the Klingon Worf in the Star Trek franchise. From his first appearance in the 1987 series premiere episode of Star Trek: The Next Generation, Encounter at Farpoint, to his last in Star Trek: Nemesis in 2002, Dorn has appeared more times as a regular cast member than any other Star Trek actor in the franchise`s history, spanning four films and 272 television episodes. He also appeared as Worf`s ancestor, Colonel Worf, in the 1991 film Star Trek VI: The Undiscovered Country.