B'Etor, like her sister Lursa, was a member of the House of Duras in the year 2370 in the mirror universe. Telok, after spending four years as a guard for the Duras family, called the Klingon sisters "unpredictable". (DS9: "Crossover") Neither B'Etor nor Lursa were actually seen in the episode, but were mentioned in dialogue. As depicted in the short story "The Sacred Chalice" contained in the anthology Shards and Shadows, Lursa and B'Etor were assassinated by the mirror universe counterpart of Deanna Troi in 2371, at which time their brother Duras was still alive.