Demons (S03E08)

SG-1 arrives at a medieval village and frees Mary, a young woman who has been left outside tied to a stake. Simon, friar of the village and Mary's friend, explains that Mary is a sacrifice for the demon that plagues their village. The leader, called The Canon, chose her when he mistook her illness for an evil possession. When the demon arrives and finds no sacrifice, it promises to destroy the village the next day unless five humans are left as sacrifices. SG-1 recognizes this "demon" and plots to destroy it, but The Canon pronounces SG-1 evil and condemns them to be sacrificed. SG-1 must convince Simon to go against everything he believes and set them free so that they can rid his village of its "demon" forever. (Metro-Goldwyn-Mayer (MGM))