Point of View.

The SGC is taken aback when an alternate reality version of Samantha Carter and the deceased Major Kawalsky are found in a secured building in top secret Area 51. To transport themselves to our reality, they used the quantum mirror. When Carter and Kawalsky are taken to the SGC for debriefing, they can't believe how different everything is in this reality. Here Colonel Jack O'Neill is alive, whereas in their alternate reality he was married to Dr. Carter before his recent death at the hands of the Goa'uld. Teal'c is an ally rather than the enemy, Major Kawalsky has been dead for several months, and their Samantha Carter is a Major who is identical in appearance, Dr. Carter begins to suffer from temporal distortion, a side effect caused by travel through the quantum mirror. Major Carter determines that Dr. Carter will die unless she is returned to her alternate reality. Unfortunately, in her reality, the Goa'uld are swarming the SGC and returning means certain death. SG-1 must use their resources and knowledge to return with their new acquaintances and overthrow the Goa'uld.