AT: "mu"
Lieutenant commander Montgomery Scott was chief engineer of the Terran starship the ISS Enterprise.
In 2267, Scott, Kirk, Uhura and McCoy were transporting aboard the ISS Enterprise following negotiations on the Halkan homeworld. While attempting to transport through an ion storm, Scott and crew were exchanged with their counterparts from a mirror universe, and arrived aboard the USS Enterprise, whereas their counterparts arrived aboard the ISS Enterprise. Scott and the three others were immediately placed in the brig of the USS Enterprise, whereas their counterparts were able to somewhat acclimate to life aboard the ISS Enterprise.
There, Scott's counterpart, Montgomery Scott observed how different the ISS Enterprise was from the USS Enterprise, as did that others that transported there with him. (TOS: "Mirror, Mirror")
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