The Mirror Universe counterpart of Calhoun first appears in "Cutting Ties", a story in the 2007 anthology "Star Trek Mirror Universe: Obsidian Alliances". In the mirror universe, instead of witnessing his father's fatal beating at the hands of the Danteri, young M'k'n'zy begs for his father's life, insisting that he has no knowledge of D'ndai's rebellious activities. Humiliated by what he sees as his son's weakness, Gr'zy disowns the boy, who is treated as an outcast. When Praetor Hiren, the leader of the Danteri's allies, the Romulans, comes to Calhoun, he takes the boy, whom he renames "Muck", to live with him on Romulus, as assurance against further rebellion. The abusive Hiren gives Muck a scar on his face corresponding to the one possessed by Captain Calhoun in our universe. After a year in Hiren's residence, Hiren orders the boy to execute Gr'zy, who has continued his rebellion, but Gr'zy commits suicide before Muck can do this. The furious Hiren banishes Muck to the mines of Remus, where the young slave endures years of torment from other miners, until he kills his tormenters. He is eventually purchased by the Mirror Soleta and her father, Rojan, and becomes Soleta's lover. Muck and Soleta are present during a meeting arranged by Praetor Hiren between Rojan and the Mirror Lord Si Cwan of the Thallonian Empire and Falkar of Danter aboard Si Cwan's ship, the "Stinger". There, Muck meets the Mirror Kalinda, Burgoyne 182, Zak Kebron, Robin Lefler, and Elizabeth Shelby. Muck discovers that the Mirror Mark McHenry's god-like powers are used as the ship's intelligence and power source.