In 2293, K'tanco, along with the IKS Klothos's mirror duplicate, escorted the ISS Excelsior out of Klingon space, when the group was set upon by enemy fighters. (TOS game: Shattered Universe) The regular universe K'tanco was mentioned as Kang's command in a cut line from the DS9 episode "The Sword of Kahless", leading us to believe that the mirror Kang might've been commanding the counterpart vessel.