Jack is awoken by some people he has never seen wearing very weird cloths. They tell him he has been cyogenically frozen and that the other SG-1 members are dead. After a while Jack starts realizing that they may not be telling the truth about SG-1's fate.
Episode number: 2x22 Production Number: 222 Airdate: Friday March 12th, 1999
The second season of Stargate SG-1 is the only one in which all five original cast members appear in every episode.
It is never revealed how Hathor gained control over both Serpent and Horus Guards, especially considering the nishta derivative she used in "Hathor" had no effect on Teal'c and, presumably, would not on any other Jaffa either.