Star Trek: Section 31's Emperor Philippa Georgiou (Michelle Yeoh) began Star Trek: Discovery as a villainous character who eventually joined the side of the heroes, setting up a potential similar return for iconic Star Trek villain, Khan Noonien-Singh (Ricardo Montalban). Emperor Georgiou was a ruthless dictator from the Mirror Universe who was the opposite of her Prime Universe counterpart, Captain Georgiou. Though her character started out as an antagonist for Michael Burnham (Sonequa Martin-Green) and the crew of the USS Discovery, she eventually joined their side, even traveling with them to the far future in Discovery season 3.
https://screenrant.com/star-trek-michelle-yeoh-setup-khan-spinoff-hero/