Worf, son of Mogh is a fictional character in the Star Trek franchise, portrayed by actor Michael Dorn. He appears in the television series Star Trek: The Next Generation (TNG), seasons four through seven of Star Trek: Deep Space Nine (DS9) and the third and final season of Star Trek Picard, as well as the feature films Star Trek Generations (1994), Star Trek: First Contact (1996), Star Trek: Insurrection (1998), and Star Trek: Nemesis (2002). Worf is the first Klingon main character to appear in Star Trek, and in 11 seasons as a regular character on TNG and then DS9, has appeared in more Star Trek franchise episodes than any other character. He is scheduled to appear in third season of the Paramount+ series Star Trek: Picard in 2023. Casting Initially, Worf was not intended to be a regular character, as Gene Roddenberry wanted to avoid "retreads of characters or races featured prominently in the original Star Trek series". Accordingly, a cast portrait released in June 1987 to promote the upcoming series did not include Worf. Several "tall, slim, black actors" auditioned for Worf before Michael Dorn came along. Not only did the Worf character become a regular on The Next Generation, he was continued on the Deep Space Nine series for four more seasons (1995–99) and talk of a spin-off Worf show continued even into the 2010s. He made his debut in 1987 in "Encounter at Farpoint", and last appeared in character in 2023 in Picard season 3. Dorn as Worf made 283 on-screen appearances, the most of any actor in the Star Trek franchise. Family history Worf was orphaned as a child as a result of the Khitomer Massacre, and raised on Earth by human parents: Helena and Sergey Rozhenko. This creates conflicts between his upbringing and his desire to honor his biological heritage. He has two brothers, each with their own respective backstories, as well as two adoptive human parents, and one son. Important Star Trek episodes for Worf's family include"The Bonding", "Sins of the Father", "Family", "Reunion" and "Homeward" in The Next Generation, and "You Are Cordially Invited" in Deep Space Nine. The House of Mogh was a family of high social and political rank, and was for a time represented on the Klingon High Council. In Star Trek VI: The Undiscovered Country (set around 70 years before the Next Generation era began), Colonel Worf (also