AllMovie

Arriving on a dead planet, the SG-1 team finds an ancient artifact, which emits strange elecromagnetic signals. The team brings the artifact back to earth through Stargate, only to discover that they are transporting a self-destructive alien virus, one that grows more powerful and dangerous with each attempt on its life. In desperation, Carter (Amanda Tapping) suggests that O'Neill (Richard Dean Anderson) allow his body to be used as the alien's host so that the team can attempt to establish communications--but they'd better hurry before the entire earth is reduced to rubble.