Ascension

Plot:

SG-1 finds a weapon on planet 616. As Carter is inspecting it, a spirit alien interacts with her. But Carter passes out. So the alien follows them back through the Stargate. Hammond believes there may be something wrong with Carter and sends her home. The alien takes the form of a man and calls himself Orlin. He lives with Carter for a while and the rest of SG-1 think she's going crazy. In time Orlin and Carter fall in love. But the pentagon finds out about the alien and surround Carter's house.