In the mirror universe, Gaffney is a security crewmember on board the ISS Enterprise. He had originally been a scientist, with a special interest in geology and astrophysics. Although he'd had a promising career, he left the sciences division to join security, a field with greater advancement opportunities. (Star Trek CCG^{[citation needed]})

ISS Enterprise (NCC-1701) personnel

Phillip Boyce • Christine Chapel • Pavel Chekov • J. Mia Colt • Robert D'Amato • Willard Decker • Michael DeSalle • Fein • Finney • Karl Franz • Gaffney • David Garrovick • Hadley • Ilia • James T. Kirk • Winston Kyle • Roger Lemli • Jabilo M'Benga • Leonard McCoy • Marla McGivers • Marlena Moreau • Number One • Carolyn Palamas • Elizabeth Palmer • Christopher Pike • Janice Rand • Kevin Riley • Saavik • Montgomery Scott • Elizabeth Sherwood • Solok • Spock • Stang • Hikaru Sulu • Nyota Uhura • Xon • unnamed ISS Enterprise personnel