Carter is stranded out in space on the Prometheus and all the crew seems to have vanished. She suffers a head injury, and starts hallucinating her fellow team members.
The interaction between Carter and the parts of herself manifesting themselves as the other SG 1 team members is highly amusing. The exchange between herself and O'Neill especially is very good, if a bit sad for Carter/O'Neill shippers such as myself.
Still, it shows us a lot about Carter's inner workings, and I appreciated a lot as such. Carter often seems the most closed of the team, hiding her true feelings from herself as much as everyone else.
It was nice to get a glimpse into her mind for a change.