Kassadae in the mirror universe was born as a Vulcan instead of a Romulan as in the normal universe. Raised under the continual subjugation of the Terran Empire, who still did not entirely trust the Vulcans after Spock's reforming of the first Terran Empire. Kassadae was part of a group within the Terran Empire that was trying to re-establish the reforms that Spock brought in. With the benefit of hindsight, it is assumed that they will be more careful. She also helped Rachel Covaks avoid the other Terran Empire officers.