Frozen

The SG-1 team travels to the Antarctic science station when the scientists there discover an ancient body in the ice. The age of the ice core samples would indicate that the body predates mankind. As they thaw the body, it comes to life. It's a young woman who they call Ayiana. As Ayiana gains strength, those around her all fall ill having contracted an unknown virus which they believe Ayiana carried. The new arrival also shows healing powers and can seemingly cure any illness just by touch. As she does so however she weakens to the point of death. In the end, only Col. O'Neill remains untreated and SGC seeks the help of the Tok'ra who offer an unexpected solution.