Commander Sela was an officer in the Romulan military, and an extremely important figure in the Empire's covert attempts to destabilize both the Alliance and the Horde. She was the product of a union between Starfleet officer Tasha Yar's counterpart from an alternate timeline and a Romulan general. In the year 2344, while in the middle of a battle with four Romulan Warbirds, the USS Enterprise-C traveled through a temporal rift to the year 2366. This had the effect of creating an alternate timeline, wherein the Federation was at war with the Klingon Empire, and Tasha Yar had not died at Vagra II. She was defected to the Alliance once the Day the Multiverse Burned started