S3·E16 Under the Ice

Event: ARCTIC CIRCLE 1355 A.D. Sydney and Nigel are called to an Antarctic research base. Traveling there with a mechanic and an accountant (actually a secret NIA agent), they find the corpses of the research team scattered everywhere. It turns out the researchers had found a frozen Anasazi Indian, who became extinct for unknown reasons. They find one survivor, Eleanor. They discover that the Anasazi mummy is infected with a virus that causes outbreaks of violent insanity (and which wiped out the Anasazi), but Eleanor has a natural immunity. While Nigel and Eleanor try to contain the virus using cold, they discover another survivor, Rollin Harley, who thawed out the Anasazi to profit from the virus and is willing to kill. He murders the two men and traps Sydney on the surface, but she manages to get back into the base. Syd and Nigel manage to take out Harley.