Worf, son of Mogh, was born in 2340 on the Klingon home world.1 His father was head of the house of Mogh, one of the most important and powerful of all Klingon houses at the time. Shortly before his seventh birthday Worf's father took him to the Khitomer colony; while they where there the Romulans attacked the colony with the help of a traitor on the surface, killing almost everybody there. Although Mogh himself was killed, Worf survived and was rescued by a Starfleet crewman from the Excelsior class USS Intrepid. When inquiries by Starfleet failed to turn up any direct family for Worf the crewman, a propulsion specialist named Sergei Rozhenko, adopted the child and raised it as his own.2Worf had a difficult childhood; his adoptive parents lived on Gault, a farm colony world3 with less than 20,000 inhabitants.2 His parents tried to allow him to find his own middle ground between Human and Klingon culture, but Worf encountered many difficulties. He was regarded as an outsider by other children and was frequently involved in fights. In an attempt to fit in he joined a soccer team, but when he was thirteen he caused the death of an opponent during a match. The experience traumatized Worf; he became a much more restrained person, losing most of his passion for life.4
In 2357 Worf joined Starfleet academy, the first Klingon to do so.3 He graduated in 2361 as an officer,5 much to the dismay of his non-commissioned father.6 By 2364 he was a bridge officer on the USS Enterprise-D.7 With the death of Tasha Yar, Worf was promoted to chief of security on the Federation flagship in 2365.8
In 2366 Worf fathered a son with Keylehr, a half-klingon half-human woman who was acting as a Federation negotiator. Keylehr was murdered by Duras, whom Worf killed in turn.9
Later in this year evidence was uncovered that it was Worf's father who had betrayed the Klingons at Khitomer. Worf investigated and discovered that it was in fact Duras who had been the traitor; however, the Duras family was still a powerful force in the Klingon Empire with many supporters. Exposing the house to shame risked a civil war, so Worf agreed to take the blame onto his own house and accept discommendation for the good of the Empire.2 This situation persisted for over a year; late in 2367 the Duras family, now led by Lursa and B'Etor, attempted to seize control of the Klingon Empire before Gowron could be properly installed as Chancellor. Whilst Worf was on board the attack cruiser IKS Bortas he served as a tactical officer during a battle with some vessels loyal to Duras. During the battle Kurn saved the Bortas from destruction; in return for their help Gowron restored the honour of the House of Mogh.10
When Starfleet refused to involve itself in what appeared to be an internal matter, Worf chose to resign his commission in order to fight alongside Gowron.10 Captain Picard discovered indications that the Romulans where supplying military aid to the Duras family; he led a Federation fleet to blockade the Klingon/Romulan border. With their support cut off the Duras family was quickly defeated by Gowron. Once the crisis was past, Worf returned to Starfleet and assumed his old position on the Enterprise-D early in 2368.11
In 2371 Worf was promoted to Lieutenant Commander shortly before the Enterprise-D was destroyed.12 He subsequently took an extended leave to visit the Klingon world of Boreth. Later he was posted to Deep Space Nine, and was involved in the hostilities between the Federation, Klingon Empire and Cardassia which took place at this time. For his actions against the Klingon Empire Gowron once again discommended the House of Mogh.13
Whilst on DS9 Worf fell in love with Lieutenant Commander Jadzia Dax.14 Despite a somewhat stormy relationship the two where married in 237315, but some months afterwards Dax was murdered by Gul Dukat.16 Worf struggled with his feelings for Dax when Ezri came to work on the station, but the two eventually agreed to end their relationship and stay friends.17
Worf fought in several battles against the Dominion during the war.18 In the final stages of the war he became disillusioned with Gowron's leadership of the Klingon forces, and challenged him to personal combat. Worf killed Gowron but declined the leadership of the council in favour of General Martok.19 After the end of the war Martok gained revenge by asking that Worf be appointed as Federation Ambassador to the Klingon Empire.20 However, he found himself somewhat unsuited for life as a diplomat and returned to his old post as chief tactical officer of the Enterprise-E.21 He was in this post when Captain Picard took the ship to Romulus to investigate the new regime after Shinzon's coup.22
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