 Colonel Alexi Vaselov arrives at the SGC and soon becomes ill after talking with Jackson. When General O Neill tries to have him put in quarantine, Daniel starts shooting, wounding two guards. Carter and base doctor Dr. Brightman determine that what made Vaselov ill and made Jackson start shooting wasn t a disease: it was Anubis, attempting to return to his empire to get a new body to possess. O Neill places the SGC under lock down as SG-1 and the SGC attempt to force Anubis into some type of action. But the plan backfires and soon nobody can be trusted.