Montgomery Scott (mirror)

Montgomery Scott was a Human Starfleet officer serving on the ISS Enterprise (NCC-1701) in 2267, and was the Mirror Universe counterpart to Montgomery Scott (TOS episode: Mirror, Mirror).

In 2267, this version of Scott was beaming up with Leonard McCoy, Nyota Uhura, and James T. Kirk from the Halkan homeworld during an ion storm. At the same time, their counterparts from the primary universe were also beaming up from the same planet. Somehow, conditions during the ion storm caused the two parties to beam up to the opposite ships, and the mirror universe version of Scott wound up in the primary universe. It did not take long for Spock to figure out what had happened, so he locked Scott and the others in the brig until their counterparts were ready to return home, Spock made sure they were standing in the transporter chamber. (TOS episode Mirror, Mirror and TNG novel Dark Mirror).

Scott would continue to serve aboard the Enterprise, eventually rising to the rank of executive officer before being replaced prior to 2277 by Willard Decker. (TOS short story "The Sorrows of Empire") He would later survive to at least the year 2333, where he would lead a band of Terran freedom fighters against the Alliance (SGZ novel Three).

Mirror Universe Trilogy
Shatner's trilogy establishes that Scott was hung outside Starfleet Command Headquarters in 2267 alongside Leonard McCoy, Janice Rand, Willard Decker, Geoffrey M'Benga, David Garrovick and Marlena Moreau (Dark Victory).