In the mirror universe, Selar was a female Vulcan member of Memory Omega, working against the Klingon-Cardassian Alliance undercover in the Terran Rebellion and aboard Captain M'k'n'zy of Calhoun's starship Excalibur. She was a scientist by training, but also an excellent combat medic. (ST - Mirror Universe novel: Rise Like Lions; TNG - Mirror Universe novel: The Worst of Both Worlds; NF - Mirror Universe short story: "Homecoming")