The mirror universe counterpart of Michael Burnham, captain of the ISS Shenzhou and adopted daughter of Emperor Philippa Georgiou, who betrays her mother by joining Gabriel Lorca's coup.
The Terran Burnham is first described in Despite Yourself and Vaulting Ambition, where the prime Michael Burnham impersonates her. She was raised by Georgiou as her heir, became Lorca's close ally, and was believed dead after pursuing him in a shuttle.
She appears in person in the third-season episodes Terra Firma, Part 1 and Part 2, played by Sonequa Martin-Green. Sent by Carl, the Guardian of Forever, to relive the days before the coup, Georgiou uncovers her daughter's treachery but cannot bring herself to order the execution she once would have.
Georgiou instead has her broken in an agoniser booth and then offers her a way back. Burnham appears to repent and kills her fellow conspirators, but it is a ruse. When she strikes, Georgiou is forced to kill her, and is mortally wounded herself.