Episode:In the Line of Duty

Carter is possessed by a Goa'uld who claims to be an enemy of the System Lords. The Goa'uld, Jolinar of Malkshur, is being hunted by an assassin.

Summary

 * A peaceful planet is attacked by the Goa'ulds with no apparent reason.
 * As she's giving first aid to a fallen Nasyan, Carter is grapped by him and something comes into her mouth.
 * Carter's behaviour becomes suspicious among SG-1's members.