Typhon Expanse

The Typhon Expanse was a largely unexplored region of space discovered in 2277 by Starfleet. Many vessels that entered the area turned up missing, and so, in 2287, after the loss of starfleet's twelth starship to enter the expanse, Starfleet abandoned trips to it. It was commonly accepted that the ships had been destroyed by the Romulan Star Empire, due to it's proximity to the Romulan Neutral Zone, although it was well of the Federation side.

In that year, the USS Enterprise-D embarked on an exploratory mission in this sector, when it encountered a temporal distortion from which the USS Bozeman emerged, having been transported through time from the year 2278. Colliding with the Bozeman, the Enterprise was subsequently destroyed, and the resultant explosion, being in such close proximity to the distortion, ruptured the spacetime continuum. As a result, both ships became trapped in a temporal causality loop in which the Enterprise repeatedly encountered the Bozeman and was destroyed. Eventually, the Enterprise crew was able to determine the nature of the loop and avoid colliding with the Bozeman, thereby freeing both vessels from the loop.