Introduced onStar Trek: The Next Generation,the Duras sisters became a thorn in the side of Captain Jean-Luc Picard (Patrick Stewart) and the United Federation of Planets.Lursa (Barbara March) and B’Etor (Gwynyth Walsh) Duras made their debut inTNG’s"Redemption" two-parterthat bridged seasons 4 and 5. Their brother, Duras (Patrick Massett), had already appearedas an enemy of Lt. Worf (Michael Dorn) in a couple ofTNGepisodes. Although the House of Duras held sway within the Klingon Empire, they gained notoriety for their dishonorable tactics.
Ja’rod, the father of Duras, Lursa, and B’Etor, betrayed the Klingons by providing the Romulans with the means to attack the Klingon colony on Khitomer. This resulted in the Khitomer Massacre and the deaths of 4,000 Klingon colonists. Although the Klingon High Council learned of Ja’rod’s duplicity, they allowed Worf’s father Mogh to take the blame to avoid a Klingon civil war.The Duras sisters followed in their father’s and brother’s footstepsin more ways than one, allying themselves with the Romulans and becomingenemies of the Federation.

Who Are Lursa & B’Etor Of Klingon House Duras In Star Trek: TNG?
The Duras Sisters Appeared In Three Episodes Of TNG & One Of DS9
The House of Duras was determined to rule over the entire Klingon Empire, and Lursa became the mastermind of a plan to make this happen. AfterWorf killed DurasinStar Trek: The Next Generationseason 4, episode 7, “Reunion,” Lursa and B’Etor revealed that their brother had an illegitimate son named Toral (J.D. Cullum). When Chancellor K’mpec (Charles Cooper) died,the Duras sisters plotted to install Toral as the Klingon High Chancellorin opposition to Gowron (Robert O’Reilly). Lursa and B’Etor tried to persuade Captain Picard to back Toral and seduce Worf to their cause, but both Picard and Worf supported Gowron.
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The Duras sisters then allied with the Romulans to take up arms against Gowron, beginning the Klingon Civil War. The Federation aided Gowron by setting up a blockade between Romulan and Klingon space. After Lursa and B’Etor’s alliance with the Romulans was revealed,they lost most of their support from the Klingons.They later tried to rebuild their forces by scheming various ways to raise funds, as seen inStar Trek: Deep Space Nineseason 1, episode 3, “Past Prologue” andStar Trek: The Next Generationseason 7, episode 21, “Firstborn.”

What Happened To Lursa & B’Etor In Star Trek Generations
The Duras Sisters Returned For One Final Fiery Farewell
Lursa and B’Etor’s finalStar Trekappearance came inStar Trek Generations,by which time they were working withEl-Aurian scientist Dr. Tolian Soran(Malcolm McDowell) with another plot to take over the Klingon Empire.Lursa and B’Etor’s Klingon Bird-of-Prey served as Soran’s getaway shipwhen he kidnapped Lt. Commander Geordi La Forge (LeVar Burton). Soran manipulated Geordi’s VISOR, allowing the Duras sisters to see through it after they returned La Forge to the Enterprise. After seeing the exact shield modulation of the Enterprise through Geordi’s VISOR, Lursa and B’Etor fired through the ship’s shields.
The Duras sisters perished in a fiery explosion, but they also destroyed the Enterprise-D.
The Duras sisters launched a devastating and relentless attack on the Enterprise,severely damaging the ship. The Enterprise crew found a way to destroy the Bird-of-Prey,killing Lursa and B’Etor as their ship exploded.Unfortunately, the damage to the Enterprise was so extensive that the ship suffered a warp core breach and the saucer section crash-landed on the surface of Veridian III. The Duras sisters perished in a fiery explosion, but they also destroyed the Enterprise-D, a feat no otherStar Trek: The Next Generationvillain managed.