Frozen (S06E04)

When woman is found frozen in the ice near an Antarctic research station, the SG-1 team is sent to investigate. The three scientists who found the woman - Michaels, Osbourne and Dr. Woods - believe she is thousands of years old. Tissue tests show that, unlike normal human cells, which suffer irreparable damage when frozen, the woman's cells are perfectly intact. Aiyana, as Michaels has named her, is defrosted and slowly comes to life. EEG's indicate that Aiyana may be an example of advanced human evolution, with cells that have evolved to withstand sub-zero temperatures. Carter theorizes that her races may have evolved long modern day humans. Michael's contracts an incurable virus from Aiyana, who seems immune to its effects. Osbourne falls ill. Then Dr. Woods gets lost in an Antarctic blizzard, forcing Teal'c and O'Neill set out on a rescue mission. Teal'c and O'Neill find the doctor nearly frozen and haul him back to the base dome for treatment. As they desperately try to save his life, Aiyana steps forward and heals Woods with her bare hands. After curing Osbourne, Michaels and Carter, Aiyana collapses in exhaustion. With her immune system weakened by the stress of all that healing, Aiyana succumbs to the virus as well. O'Neill begins to show symptoms, but Aiyana dies before she can help him. Back at SGC, a Tok'ra named Thoran informs the team that O'Neill will die unless he accepts a symbiote. O'Neill is reluctant, but Carter assures him that the symbiote will only stay until he is cured and the Tok'ra can find a new host. When Carter mentions that the symbiote has important information acquired during a recent mission, before the untimely death of its host, O'Neill agrees to have the procedure. (Metro-Goldwyn-Mayer (MGM))