Star Trek: The Next Generation - Season 4Eps26

: Worf seeks to clear his family's name by supporting Gowron. When Picard refuses to involve Starfleet in what is considered an internal Klingon affair, Worf resigns his commission to fight alongside his brother, Kurn.

: Picard’s decision triggers a Klingon civil war, as the Duras faction, secretly backed by the Romulans , rebels against Gowron.

: The sisters of the late Duras, Lursa and B'Etor , challenge Gowron’s claim by presenting Toral , an illegitimate son of Duras. Picard ultimately denies Toral's candidacy based on Klingon law.

: The episode ends with the shocking revelation of a Romulan commander, Sela , who bears an uncanny resemblance to the late Tasha Yar .