Worf was willing to consider the idea that Kahless was genuine because he believed the Klingons had lost their ways.

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

Worf resigned from Starfleet to fight for Gowron and served on his brother's ship.

After the invasion had begun, Gowron traveled to DS9 to ask Worf to join him in battle.

After a year of war between the Federation and the Klingons, Worf joined a team sent to investigate claims that Gowron was a changeling in disguise.

When Sisko eventually returned with a fleet of Federation ships to retake the station, Worf and Martok lobbied Gowron to send Klingon ships to join the battle.

In 2375, Worf became concerned with the leadership of Gowron.

Recognizing that Gowron was jeopardizing the entire war effort, Worf tried to convince Martok that he should challenge Gowron for the leadership.

After Martok refused, Worf decided to challenge Gowron himself, citing his faulty battle planning, his dishonorable conduct in trying to discredit Martok, and poor strategies at the later stages of the Dominion War.

After a brief battle, Worf killed Gowron ; by right he was proclaimed the new chancellor of the Klingon High Council.

A grateful Martok would later invite Worf ( who had earlier been stripped of his family name by Gowron ) to join Martok's house.

Worf tries to convince Martok to challenge Gowron, but he refuses.

Worf then kills Gowron himself, and rather than accept the title of Chancellor, gives it to Martok (" Tacking Into the Wind ").

Despite this, Gowron journeys to the station, hoping to get Worf to argue on behalf of the Klingons, even though Worf believes Gowron to be wrong.

Gowron angrily warns him that if Worf turns his back on him, he will reinstate the discommendation and that not even Worf's brother Kurn will be spared.

" Gowron spits at Worf, but Worf simply replies, " Except my honor.

Incensed by such a violation of Klingon honor codes, Worf disregards Martok's request and confronts Gowron, who dismisses Worf's accusation and adds that his " child's uniform "-- referring to his Starfleet uniform -- is the only thing saving him from his true fate: a duel to the death ( to wit, his own.

) In response, Worf simply removes the comm badge, places it on the table, and informs Gowron that he's now speaking as a member of the House of Martok.

Gowron takes the bait, but after a hard-fought duel, Worf kills Gowron.

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.

The station's first appearance in Star Trek: The Next Generation was during the sixth season episode " Birthright " and in addition, two Next Generation characters, Miles O ' Brien and ( from Season 4 onwards ) Worf, became regular members of DS9.

Worf was the only character to be a regular in more than one live-action Star Trek series ( While Miles O ' Brien was featured in both The Next Generation and Deep Space Nine, he was not a regular cast member in the former series ).

Worf was at first not intended to be a regular character, since Gene Roddenberry wanted to avoid " retreads of characters or races featured prominently in the original Star Trek series ", and so the June 1, 1987 cast portrait did not include Worf.

In First Contact Worf is initially commanding USS Defiant before he is beamed aboard the Enterprise, while in Insurrection Picard jokes that Worf was late for his bridge shift due to being accustomed to life aboard Deep Space 9.

Worf was born in 2340 on the Klingon homeworld as the son of Mogh.

Although Worf was raised by humans, he considered himself a Klingon at heart and studied the ways of his people.

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 ").

Worf learned of Kurn's existence when Kurn was assigned to the Enterprise as an Exchange Officer.

When they and the Enterprise crew discovered that it was in fact Duras ' father that betrayed the Empire, Worf, realizing that the powerful House of Duras could not be publicly shamed without throwing the Empire into civil war, accepted a ritual discommendation from the Klingon High Council.

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 ").

K ' Ehleyr was eventually murdered by Duras when she found evidence of his involvement in the effort to discredit Worf.

In 2369 while the Enterprise was at Deep Space Nine, Worf investigated a claim that his father might still be alive in a Romulan prison camp.

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.

Worf felt the war was wrong and he could not support it.

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

Despite this, Worf became convinced that the Klingons would make a leap of faith and accept him as the legitimate heir of Kahless.

At the end of the immediate crisis, Sisko convinced Worf to join the crew as Strategic Operations officer.

Jadzia was married to Lieutenant Commander Worf, who at first refuses to speak to Ezri, convinced that Jadzia has gone on to Sto-Vo-Kor and can no longer exist through the Dax symbiont.

Worf also has a human brother, Nikolai, through his adoption by the Rozhenkos, with whom he often quarreled.

After receiving orders from Sisko not to carry out the honor killing, Worf arranged for his brother to have cosmetic surgery and his memory wiped so he could start a new life with no ties to the House of Mogh.

Understanding what Worf had done, Martok thanked him for reminding him of his duty as a soldier and offered him a place in his house as his brother.

In " Sons of Mogh ", she supports Worf's attempt to kill his brother Kurn, and in " Soldiers of the Empire " she and Worf go on a tense mission aboard a Klingon ship.

Meanwhile, Worf requests a leave of absence to visit his brother, Kurn, who controls a small fleet of Birds of Prey, and to urge him to back Gowron, as, once installed as the Leader, Gowron can reinstate their family name.

In this episode, Lt. Worf, the Klingon Chief of Security of the Federation Starfleet Starship USS Enterprise must work with his human adoptive brother Nikolai Rozhenko, a Federation anthropologist to save a small segment of natives from a primitive alien culture on a dying planet.

Concerned for his brother, Worf volunteers, and Picard orders him to go alone and be surgically altered to pass as a Boraalan so as to prevent any possible contamination of the planet's culture.

Worf transports to the planet and discovers that his brother set up the shield to protect the local villagers he had been assigned to observe.

While relieved that Nikolai is safe, Worf is concerned by what his brother has done and tells him that he has only postponed the deaths of the villagers.

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.

Worf and Rozhenko have a further falling out and nearly come to blows when Worf learns that his brother has impregnated one of the villagers, and Nikolai tells Worf that he intends to remain with the Boraalans.

Worf and Nikolai finally make peace when Worf accepts and admits that the Boraalan race would not have survived if not for his brother ’ s unconventional methods.

Worf confronts Kurn alone, where Kurn reveals he is Worf's younger brother ; when the rest of Worf's family left to the Khitomer colony, he was left with a friend of their father, Lorgh.

This is the reason that Worf's brother Kurn was granted a seat on the council after the 2367 civil war, and was later taken from Kurn when Worf refused Gowron's orders to turn against the Federation in 2372.

Two Borg seize Data and Lore is about to execute his " own, dear brother ", when Riker and Worf arrive, accompanied by Hugh and some of his rebel Borg.