Janus Vortex

The Janus Vortex is a spatial anomaly that affected the crew of the USS Excelsior in the late 23rd Century.

The events are depicted in the videogame Star Trek: Shattered Universe.

Spoiler Warning Plot Details Follow

After the ship arrived in the vortex, the entire crew had exchanged places with the crew of the ISS Excelsior, of the same Mirror Universe previously encoountered by mwmbera of the USS Enterprise crew. The chief difference between the two ships being that the Excelsior of this universe was equipped with a fighter bay instead of a shuttle bay.

Upon arrival in the universe, Sulu quickly realised that the only way back to the standard universe was via the Janus Vortex that was now in Tholian space. To get there, the Excelsior had to contend with the mirror versions of Klingons, Romulans and Tholians, plus the ISS Enterprise under the command of Pavel Chekov, who had become increasingly suspicious of his comrade.

After a difficult journey, the Excelsior managed to switch back places with its mirror universe counterpart, that had been easily contained by Commander Pavel Chekov in command of the USS Enterprise A

Spoilers End