"Legacy" is the 80th episode of the syndicated American science fiction television series Star Trek: The Next Generation, the sixth episode of the fourth season. It marked the point at which the series surpassed the number of episodes in the original series. Set in the 24th century, the series follows the adventures of the Starfleet crew of the Federation starship Enterprise-D. In this episode, the Enterprise crew is caught in the midst of a civil war on Turkana IV, former crew member Tasha Yar's homeworld. While negotiating with one of the factions, they discover that the faction's representative is Tasha's younger sister, Ishara Yar. Plot The Enterprise, under the command of Captain Jean-Luc Picard (Patrick Stewart), responds to a distress call from the Federation freighter Arcos, which has suffered engine failure and taken emergency orbit around the planet Turkana IV, the birthplace of the Enterprises late chief of security, Tasha Yar. The Enterprise arrives just as the Arcos explodes, and finds a trail left behind by the freighter's escape pod leading to the colony. Turkana IV's government collapsed 15 years before; and the last Federation ship to visit, six years earlier, was warned by the colony's warring factions that trespassers to the planet would be executed. Because the freighter crew's lives are in danger, Picard decides to attempt a rescue. Commander Riker (Jonathan Frakes) leads an away team to the surface, where they find the colonists initially unperturbed by their presence, but soon end up in a standoff with one of the colony's two remaining warring factions, the Coalition. Their leader, Hayne (Don Mirault), reveals that the other faction, the Alliance, holds the Arcos survivors hostage, and offers the Enterprise the Coalition's support in exchange for Federation weapons, a proposal that Riker rejects. Hayne, however, after learning of Tasha Yar's service aboard the Enterprise, instead offers as a liaison Ishara Yar (Beth Toussaint), saying she is Tasha's sister. Picard accepts Ishara aboard; although the crew is initially skeptical, DNA tests support her claim, and she gradually gains their trust. Commander Data (Brent Spiner), who was especially close to Tasha, becomes friends with Ishara, who seems ready to leave behind her life in the colony. To find the hostages, Chief Engineer Geordi La Forge (LeVar Burton) suggests using the crashed escape pod's instruments; Ishara recommends that she beam separately to a nearby location as a distraction, because her implanted proximity device