Overall Rating: Excellent
SG-1 returns to Earth from a mission to find the Harcesis child, who was hidden away by Amonet (“Forever in a Day”). Per protocol, SG-1 heads to the infirmary for a check-up. A chemical spill occurred at SGC, however it is being contained. The team is given shots which knock them unconscious. Because of the Goa’uld symbiote he carries, Teal’c awakens first. He sees an alien standing near Dr. Frazier and General Hammond, and no one is alarmed by its presence. With the alien, plus being drugged, Teal’c deduces that SGC has been invaded by aliens -- a foothold situation. Teal’c is able to find, and awaken, only Carter. They try to escape from Cheyenne Mountain. Colonel Maybourne is contacted by Carter, and told there is the foothold situation at Stargate Command. Or, is there?
The chemicals from the spill can cause hallucinations, and paranoia. Carter and Teal’c may just need some medication to overcome the side effects of the chemicals. However, if the foothold situation is true, then Earth’s fate rest on a few people confronting an alien army, without knowing who is human, and who is not.
This is one of the best Stargate SG-1 episodes that is unrelated to the ongoing Goa’uld story arc. The dialog is not sparkling, however it has strength, and rings true to the situation. Tom McBeath returns as Maybourne, and is great. The regular cast performs very well, with Tapping excelling as Carter. The possible foothold situation is dramatic, and believable. The aliens have an interesting appearance, unlike other aliens previously seen on the show.