Calhoun next appears in "Homecoming", a short story in the 2009 anthology "Star Trek: Mirror Universe - Shards and Shadows". The "Stinger" has now been renamed the "Excalibur", and has embarked on a campaign against the Alliance, gathering a small army as it attacks Alliance colonies, becoming a symbol of the rebellion. The "Excalibur" rescues the Mirror from an escape pod. Selar, a scientist and spy disguised as a Romulan named Thue, was part of a team en route to Romulus to assemble a thalaron bomb in order to establish weapons parity with the Alliance. Her cargo vessel, which carried the bomb's final component, C-170, was attacked by the Alliance to prevent the Romulans from using the bomb against them. The "Excalibur" crew track down the hijacked supply ship and retake it, before journeying to Romulus with the C-170. As they assemble the bomb, they are confronted by Praetor Hiren, meeting Mac for the first time since his childhood. Hiren is forced into an allegiance with Mac against the Alliance, who arrive to take possession of the thalaron bomb, which they intend to test detonate on Romulus. During the ensuing melee, Hiren, who had tried to prevent an open confrontation with the Alliance, orders his forces in orbit to attack the Alliance ship battling the "Excalibur", and the bomb is accidentally detonated. Mac and his crew, along with Hiren, are transported to the "Excalibur". Romulus is rendered uninhabitable for a millennium, with only 50,000 Romulans surviving among their fleet - which, on Hiren's orders, proceeds to join Mac's rebel forces.