| abstract | - In 2256, Harcourt Fenton Mudd acquired a device created by a Four-dimensional race that contained a time crystal, and used it to create a repeating time loop, in order to steal the USS Discovery and sell it to the Klingons. (DIS: "Magic to Make the Sanest Man Go Mad") In 2278, the USS Bozeman encountered a temporal distortion, causing it to travel forward in time to the year 2368, where it encountered the USS Enterprise in the area of space known as the Typhon Expanse. When the Bozeman collided with the Enterprise, the resultant explosion, being in close proximity to the temporal distortion, ruptured the spacetime continuum, trapping both ships in a causality loop wherein the Enterprise continually encountered the Bozeman and was subsequently destroyed. Eventually, the Enterprise crew began to realize what was happening due to a sense of déjà vu they kept experiencing, as memories from previous loops began imprinting themselves to persons inside the loop. They devised a means whereby they could send a specific message into the next iteration of the loop via dekyon emission, where it was detected by Data's positronic subprocessors. The effort proved successful, and Data was able to use the transmitted information to avoid the collision with the Bozeman, thereby escaping from the loop. Altogether the Enterprise had spent 17.4 days inside the fragment of time. (TNG: "Cause and Effect" ) In 2378, Q Junior trapped the crew of the USS Voyager in a temporal loop in which they kept experiencing the last thirty seconds over and over. (VOY: "Q2")
- A temporal causality loop (or temporal loop) is an event where time skips back to a previous point and repeats itself causing a loop of a specific time period. The USS Enterprise-D and the USS Bozeman were caught in a casualty loop in the Typhon Expanse that was reset by the destruction of both vessels from colliding with each other near a temporal anomaly. The loop was broken when the crew of the Enterprise managed to avoid the catastrophic collision. (TNG: "Cause and Effect")
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