His sickbay was filled with torture devices that appalled his primary universe counterpart.
So alike were the actions of the two McCoys that they both spilled acid on tables in their respective sickbays, creating a duplicate burn mark on each.
In 2267, Dr. McCoy accompanied a landing party consisting of Captain James T. Kirk, Lieutenant Commander Scott, and Lieutenant Uhura to the surface of the planet Halka to demand that the Halkans hand over their dilithium crystals to the Terran Empire. When the party were beamed back to the Enterprise, an electric storm caused the party to transpose with their primary universe counterparts. However, the landing party were later put back into their correct reality.
After the landing parties returned to their respective universes, the Spock of the primary universe told his Dr. McCoy and Captain James T. Kirk that he found their counterparts to be "brutal, unprincipled, uncivilized, treacherous; in every way splendid examples of Homo sapiens, the very flower of Humanity." (TOS episode: "Mirror, Mirror")
Mirror Universe TrilogyEdit
In one permutation of the mirror universe, Dr. McCoy was hanged outside Starfleet headquarters in 2267 along with Montgomery Scott, Janice Rand, Willard Decker, Geoffrey M'Benga, David Garrovick and Marlena Moreau. (TOS novel: Dark Victory)
In the months following Spock's assassination of Captain Kirk, McCoy became more and more suspicious of the actions that Spock was taking, such as persuading Troyius and Elas to become allies, which violated orders from the Empire. Lieutenant Commander Scott and Lieutenant Uhura shared his concerns and together they plotted to remove Spock from command of the Enterprise. However, as Uhura began to carry out their plan, she was disintegrated by the Tantalus field, and McCoy's criticisms were silenced.
McCoy eventually died in 2269 of the fatal disease known as xenopolycythemia, indicating that in the mirror universe, either the Enterprise crew never encountered Yonada, or they simply destroyed the vessel. He was succeeded as the Enterprise's chief medical officer by Jabilo M'Benga, who continued to serve in that position until at least 2287. (TOS - Mirror Universe novel: The Sorrows of Empire)
|ISS Enterprise (NCC-1701) personnel|
|Robert April • Phillip Boyce • Christine Chapel • Pavel Chekov • J. Mia Colt • Robert D'Amato • Willard Decker • Michael DeSalle • Fein • Finney • Karl Franz • Gaffney • David Garrovick • Hadley • Idelson • 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|
|Chief medical officers of the starships Enterprise|
|USS Enterprise (NCC-1701)||Poole-April • Boyce • Piper • McCoy • Chapel|
|USS Enterprise (NCC-1701) (Kelvin timeline)||Puri • McCoy|
|USS Enterprise (NCC-1701) (other alternate realities)||McCoy • Boyce • Carlotti • M'Benga|
|USS Enterprise (NCC-1701-A)||McCoy|
|USS Enterprise (NCC-1701-A) (alternate realities)||Carlotti|
|USS Enterprise (NCC-1701-B)||Metcalfe • Michaels • McCoy • Morell|
|USS Enterprise (NCC-1701-C)||Casado • Stern • Aristide|
|USS Enterprise (NCC-1701-D)||Crusher • Pulaski|
|USS Enterprise (NCC-1701-D) (alternate realities)||Ogawa|
|USS Enterprise (NCC-1701-E)||Crusher • Stevenson|
|ISS Enterprise (NX-01)||Phlox|
|ISS Enterprise (NCC-1701)||Boyce • McCoy • M'Benga|
|ISS Enterprise (ICC-1701-D)||Crusher|