Little is known about the mirror universe counterpart of Peter Joseph. Gerda Idun Asmund knows Pug, very possibly as a fellow crewmember aboard the ship Stargazer. From her knowledge of her own Pug, Gerda Idun expects to find Peter Joseph lying unconscious on the floor during an emergency, although this could mean that Gerda Idun thought that Pug was incompetent, or that he would stay at his post no matter what the circumstances. (STA novel: Three)