Stargate SG-1: Season 4, Episode 5

4 - 5: Divide and Conquer

During a meeting of the Tok'ra High Council, one of the SGC soldiers goes berserk and attacks them before taking his own life. It soon becomes clear that the Goa'uld have a new weapon - a mind control technique that can turn anyone into a preprogrammed assassin. SGC soon realizes that Jack and Sam may be the next programmed assassins.