https://comicbookmovie.com/sci_fi/star-trek/star-trek-enterprise-showrunner-details-william-shatners-scrapped-return-as-villainous-captain-kirk-a207404

STAR TREK: ENTERPRISE Showrunner Details William Shatner's Scrapped Return As Villainous Captain Kirk

Apparently Shatner's ego spared us from an awful planned plotline with Mirror Kirk stuck in the Phantom Zone escaping and battling Prime Archer.