In the Stargate:Universe episode "Time", a time loop is created when a solar flare disrupts the stargate connection to the planet being explored by the crew of the Destiny, creating a time loop back into the past.
Probably a good thing, because the planet is inhabited by viciously aggressive creatures that attack the exploration party at night, and at the same time everybody begins to come down with a disease picked up on a previous planet.
The episode goes through two loops, exploring the planet with everybody dying one way or another before the episode ends with Scott explaining the situation into a Kino in case it's found the next time around.
The plot is described here but it only takes us as far as Scott's plea into the Kino (followed by a nasty end).
There is apparently a short segment somewhere that explains this but its canoniicity was said to be doubtful.
The next episode picks up with everybody alive and no mention of the time loop. How did they get out of it?