This isn't the first time the "Star Trek" world has reexplored what might have happened to Tasha Yar under different circumstances. During Season 5's "Redemption II," Denise Crosby returns to the show to play Tasha's lookalike daughter, Sela. It's revealed that in the universe from which Sela emanates, Tasha was taken prisoner with fellow members of the Enterprise-C when it crash-landed. The leader of the Romulan soldiers who takes the crew hostage grows enamored with Tasha; she agrees to become his concubine in exchange for the release of her comrades. But when Tasha tries to escape with a four-year-old Sela, the child cries out, and Tasha is discovered, captured, and executed. Sela grows up to be a Romulan military commander, and the Enterprise-C's unstuck-in-time crew soon becomes entangled in a battle for supremacy between the Romulans and Klingon empires.
In a third timeline, established during Season 3's "Yesterday's Enterprise," a change made to the flow of the timestream results in Tasha's survival. When she learns from Jean-Luc Picard (Patrick Stewart) that she died a meaningless death in his timeline, she becomes determined to change that fate. The end result is her attaining a meaningful death — one which closes a breach in time forever more.
