Worf continued to serve on the Rotaran after Sisko withdrew from DS9 at the beginning of the Dominion War.

Worf is the first Klingon main character to appear in Star Trek, and has appeared in more Star Trek franchise episodes than any other character.

* A Gorn was slated to appear in the movie " Star Trek: Nemesis " as a friend of Worf.

While Picard and Riker conceal themselves, Worf and K ' Ehleyr, clad in full traditional Klingon command uniforms, appear as captain and first officer of the Enterprise, informing Captain K ' Temoc of the T ' Ong that the war is over and ordering them to surrender.

In 2364 Worf was assigned to the USS Enterprise-D as relief flight control and tactical officer with the rank of lieutenant junior grade ( TNG: " Encounter at Farpoint ").

After an accident caused the death of Lt. Marla Astor, Worf brought the orphaned Jeremy Astor into the House of Mogh through the rite of R ' uustai ( TNG: " The Bonding ").

While Worf decided to accept this dishonor, it was decided to keep Kurn's true identity secret in order to protect his honor ( TNG: " Sins of the Father ").

She wanted to marry him but Worf refused because he did not want to share his dishonor with her and their son ( TNG: " Reunion ").

Exercising his right of vengeance, Worf fought and killed Duras allowing Duras's opponent Gowron to become chancellor ( TNG: " Reunion ").

Worf later regained his Starfleet commission ( TNG: " Redemption, Part II ").

In 1995, with TNG over, the writers of DS9 came up with the idea of adding Worf to the cast in response to pressure to boost ratings .< ref name =" charting "> Source: " Charting New Territory ".

Unlike his TNG co-stars, this was Michael Dorn's second Star Trek film, having appeared on Star Trek VI: The Undiscovered Country, portraying his TNG character's grandfather, Colonel Worf, who defended Kirk and McCoy on their trial.

He said: " When I got married my best man was Brent ( Spiner, who portrayed the ST: TNG character Lieutenant Commander Data ) and my groomsmen were Michael ( Dorn, Lieutenant Worf ) and Jonathan ( Frakes, Commander Riker ) and Patrick ( Stewart, Captain Picard ).

( There is precedent for a Starfleet officer to not wear a regulation uniform, however: Deanna Troi in Star Trek: The Next Generation only wore regulation uniform during seasons six and seven ( followed by all the movies starring the TNG crew ), while Worf wore a Klingon sash with his uniform throughout his Starfleet career on both U. S. S Enterprises and Deep Space Nine but these series take place in later centuries than Star Trek: Enterprise ).

Other Star Trek actors such as Michael Dorn ( Worf on TNG ), Brent Spiner ( Data on TNG ), Colm Meaney ( Miles O ’ Brien on TNG and Star Trek: Deep Space Nine ), LeVar Burton ( Geordi La Forge on TNG ), Nichelle Nichols ( Uhura on Star Trek: The Original Series ), Avery Brooks ( Benjamin Sisko on DS9 ), Paul Winfield ( Clark Terrell in Star Trek II: The Wrath of Khan ), David Warner ( various characters, most notably Gul Madred in " Chain of Command ", a two-part episode of TNG ) and Kate Mulgrew ( Kathryn Janeway on Star Trek: Voyager ) were guest or recurring stars in the series.

The first was Colonel Worf ( Star Trek VI: The Undiscovered Country ), who is the grandfather of Worf ( TNG ) and father of Mogh.

Along with Worf, O ' Brien is one of the two main characters that moved from TNG onto DS9.

In the TNG episode " Where Silence Has Lease " when Riker and Worf prepare to beam to the USS Yamato, Riker refers to him as a " lieutenant " and the character is wearing lieutenant collar pips.

The character Worf does so in almost every one of his appearances through two series and four films.

With the advent of the series Star Trek: The Next Generation ( 1987 )— in which one of the main characters, Worf, was a Klingon — and successors, the language and various cultural aspects for the fictional species were expanded.

This retcon itself was later retconned, in Star Trek: Enterprise, via a storyline in which it is revealed that the original, quasi-human appearance of the Klingons is due to a genetic mutation caused by an engineered virus – as it happened, " genetic engineering " ( Chief O ' Brien ) and " viral mutation " ( Dr. Bashir ) had been the guesses Worf refused to confirm or deny.

Worf learned that the Klingons were planning to invade Cardassia because of a coup which they had been led to believe was engineered by the Dominion.

He felt that the ritual, which involved Worf killing him, was the only way to restore his honor.

The episode " Heart of Glory ", which focuses on Worf and his relationship to other Klingons, is credited with planting " many seeds for successive Klingon storylines ... and new insights into Klingon culture ".

Vulcan's Forge is also mentioned in " Change of Heart ", in which Worf wants himself and Jadzia Dax to honeymoon there, as well as in episodes " The Forge ", " Awakening " and " Kir ' Shara " from Star Trek: Enterprise.

The Enterprise arrives in time to save the crew of the USS Defiant which is being commanded by Lieutenant Commander Worf.

Elsewhere, Commander Worf assists in the defense of the Ba ' ku homeworld from the Son ' a, after which he is informed of the Enterprises discovery.

Season Four begins with " The Way of the Warrior ", which marks the arrival of Worf.

This plot was planned to shift the focus of Star Trek: Deep Space Nine episodes back toward the struggle with the Dominion, which had been postponed in earlier production discussions with Paramount in favor of bringing Worf and a Klingon-based plotline into the series.

Lt. Worf, in the meantime, thinks that the Captain is being tested as a warrior and advocates an aggressive stance which Riker says he will take as a last option.

Riker has Worf take a shuttlecraft to try to retrieve the Captain which fails when the aliens disable the craft and force it to return to the Enterprise.

After sadly witnessing the atmospheric dissipation extinction event transpire, the crew is puzzled by an unexpected power drain, the origin of which Worf tracks to the Holodeck.

A mistrustful Picard orders Worf to accompany him, which Worf finds difficult as he is disgusted by his brother ’ s actions and wants no more to do with him.

Inside the Holodeck, Rozhenko is devastated by the possibility that Vorin might return and inform the other villagers of the reality of their situation, which would invalidate all the work he and Worf have done and destroy everything the villagers believe in.

Kurn tells Worf that their father Mogh is being charged posthumously as a traitor by Duras, the son of Mogh's rival, in the Khitomer massacre, which will mar the Mogh family name for generations.

Redjac is tricked into facing Worf in single combat, which focuses all his energy into one location, allowing the crew to transfer him into a storage pod and trap him on a distant moon.

Peter David's novel Imzadi explores the backstory between Riker and Troi, and its sequel Triangle: Imzadi II covers the cooling of the Worf / Troi relationship, which was left unexplained on screen.

Picard, Worf, and Keiko each declare that they're willing to die, which forces the three prisoners to relinquish their hosts.

The last episode was taped in early 1989 ( but aired that March ), which did not signify an end of any sort, but was played out as a high event-the cast went on a space adventure with guest star Michael Dorn as Lt. Worf, from Star Trek: The Next Generation ( in the episode, " Webtrek ").

Jack Crusher confronts his ex-wife about the affair she is having with Track-A Picard ; during the argument, which Track-B Picard witnesses, she is accidentally killed ; additionally, members of Track C attempt to kill Worf, and believe all the members of the crew from the other two universes are really Klingon impostors.

* Data states " There is no record of any Federation vessel encountering anything remotely like this " despite the fact Captain Kirk encountered just such an area of blackness in The Immunity Syndrome, which fits the " old Klingon legend a gigantic black space creature which was said to devour entire vessels ", that Worf recalls perfectly.