Leonard McCoy (DMU)

In the dark mirror universe, Doctor Leonard H. McCoy was a Terran officer in Imperial Starfleet who served as Chief Medical Officer aboard the ISS Enterprise in the 2260s.

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 2266, McCoy spilled acid on a lab table in sickbay. In contrast to the primary universe, the stain was not cleaned and remained until at least another year.