“Sunday” is episode seventeen of season three of Stargate: Atlantis.
Almost everyone on Atlantis has a day off. It starts out very briefly during the day off when there is an explosion, killing or injuring several people, before going back in time several times for different periods of time, covering different people’s viewpoints in the time leading up to the explosion, including information that leads to the cause, before returning back to the time of the explosion.
The story then continues from that point with an investigation into how it happened and what caused it.
Not a happy episode by the end of it, and I didn’t really like how it turned out. Probably not a bad episode, I just didn’t enjoy the ending.