Legacy.
During a routine mission, the SG-1 team discovers a room containing the
corpses of a league of Goa'uld who challenged the System Lords. One is
holding a tablet, and after Daniel touches it, he begins to hear voices and see
nightmarish visions. Medical tests indicate schizophrenia. Whatever is
interfering with Daniel's mind, however, soon transfers to Teal'c with far more
deadly consequences. As the parasite leaves his body, Daniel hears the voice of
the dead Ma'chello declaring death to the Goa'uld. Daniel realizes he was infected by Ma'chello's
Goa'uld killing parasite, a theory borne out by Teal'c's rapid deterioration. Believing the tablet holds
the key to Teal'c's survival, the team brings it to the lab, but as they open it, the parasites ooze into
Dr. Fraiser, Carter, and O'Neill. Carter proves immune, but with parasites inside them, Fraiser and
O'Neill deteriorate rapidly and Hammond has no choice but to seal the lab off with the three inside.
