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Leonard McCoy
Leonard McCoy was, in the mirror universe, the chief medical officer of that reality's ISS Enterprise, leading a very similar life (albeit with widely differing moral character) as his counterpart from our universe.
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. (TOS: "Mirror, Mirror")
- Like his counterpart, McCoy was played by actor DeForest Kelley.