Foothold (S03E14)

En route to the infirmary after an extended mission, SG-1 learns that part of Stargate Command has been sealed off because of a chemical leak. Soon afterward, during their routine examinations, medical officer Dr. Janet Fraiser injects each member of the team with a sedative, rendering them unconscious. Teal'c is the first to awaken; he secretly observes Dr. Fraiser and Gen. Hammond talking with two aliens. The general orders Teal'c and Maj. Samantha Carter placed in holding cells. Feigning unconsciousness, Teal'c waits until he and his escorts are away from the infirmary before overpowering the guards and waking Carter. Carter and Teal'c quickly realize that they cannot trust anyone in Stargate Command and must seek help from outside the base. During the escape, one of them is captured. The other must rely on the one person they can't trust in order to save SGC and Earth from imminent invasion. (Metro-Goldwyn-Mayer (MGM))