Joseph Ruskin appeared in all five live-action series, although only in a Next Generation movie, not a television episode.
Majel Barrett appeared in three of the series, but provided the computer voice for all five, and also for the short-lived animated series.
Erick Avari appeared in at least 3 of the Television series: TNG, DS9, and Enterprise, playing a Klingon, Bajoran, and human, respectively. Some sites say he also appeared on VOY, but if true it is uncredited.
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IMDB says that William Roache has done only 1367 episodes (check it).
The correct answer is Katherine Kelly Lang as Brooke Logan from The Bold and the Beautiful with 2662 episodes and still rising.
Second place is Kate Linder as Esther Valentine from The Young and the Restless with 2585 and still rising.
Then some from The Bold and The Young randomly and then some from Days of our Lives.
The oldest soap (As the World Turns) has none that were in so many episodes.
This is what I found and is wrong:
According to the Star Trek Wiki Memory Alpha, Michael Dorn appeared in 5 movies and 272 episodes as Worf. The second place is held by Colm Meaney, who has appeared in 211 episodes, and is also the only actor to have appeared in the pilots and finales of both TNG and DS9.
When you include actors that appeared in episodes as voice only charactors, Dorn was out played. Acording to the web site IMDB, which lists all roles she (and other actors) has been in for her entire carrer, the correct answer is Majel Barrett.
She appeared in the original pilot as the first officer (Number 1) and in the origial series as nurse Christine Chapel (34 episodes). She was in the 1970s cartoon series with voices from the original cast (21 episodes). She appeared in TNG as Dianna Troi's mother in some episodes and also as the voice of the computer (96 total). She was in ST DS9 as the computor voice and as narrator in a couple of episodes (30 in all). She was in ST Voyager as the computor voice (114). She was in ST Enterprise, 2 episodes, as computor voice. She was in one episode of a series I have never heard of till today called ST New Voyages:Phase II as a computor voice. She was in a total of 298 tv episodes.
She also was in a total of 6 movies as Chapel in the earlier movies and computor voice in the later movies. Her last movie was Star Trek released in 2009. She also provided the voice for numerous Video Games. She died in 2008.
Michael Dorn is the one actor who appeared in the most Star Trek episodes and movies, period. In all of those appearances, he plays Worf, a Klingon. Except for Star Trek VI, where he plays another Klingon, also named Worf. (It's a popular theory among fans that this is TNG Worf's grandfather. There is one episode of DS9 where Michael Dorn appears as a human ['Far Beyond the Stars'], but he's part of a series of hallucinations Sisko is having, and he does appear as Worf in the episode.)
Probably the actor with the most recurring roles is Jeffrey Combs. He's best known for playing both Weyoun (a Vorta) and Brunt (a Ferengi) on DS9, as well as Shran (an Andorian) on ENT. He's also had one-shot appearances as Tiron (his first Trek appearance, from an unnamed alien race) in DS9: 'Meridian', as Penk (he worked for the Norcadians, but wasn't necessarily a Norcadian himself) in VOY: 'Tsunkatse', and as Krem (another Ferengi) in ENT: 'Acquisition'.
The one actor who has played the most different characters in all Star Trek series is Vaughn Armstrong. First appearing as Korris, a Klingon, in TNG: 'Heart of Glory', he then went on to play two more Klingons, two different Cardassians, a Romulan, a Borg, a Vidiian, a Hirogen, and a Kreetassan in two episodes of ENT. Despite all these appearances as aliens, he's probably best known for his recurring role as Admiral Forrest on Enterprise (and Forrest's Mirror Universe duplicate in 'In a Mirror, Darkly').
While she hasn't shown up in all of the episodes, Majel Barret Roddenbarry takes the grand prize for most episode contributions. Nurse Chapel, the Starfleet computer, Lwaxana Troi, she played 'em all. I can't say for Enterprise, though. Haven't watched too much of that.
The late Majel Barrett-Roddenberry is the only actor to perform in all 5 shows, with most of her contribution being the Starfleet computer voice.
That would be Leonard Nimoy (Spock). If you include both Star Trek movies and TV series, then it's Michael Dorn (Worf).
victor French
Ralph Waite is an American actor who is most famous for his role played as John Walton, in the TV series "The Waltons". He also occassionally directed the series. Waite was also seen in the mini-series "Roots".
Jill Kelly is an actor born in Febrary first, nineteen seventy - one. She is most known for being in graphic scenes and acting in a series of pornographies.
Wally had two girlfriends for most of series. They were Mary Ellen Rogers and Julie Foster. He also had a few girlfriends who were for just one or two episodes.
Michael Jai White is a famous American actor who is most known for his martial arts in movies. He appeared in the Dark Knight and Mortal Kombat movies.