Stargate SG-1 - Season 3 Episode 8 -

SG-1 lands on a planet where a culturally 'medieval Catholic' community lives in fear of a demon of Unas's species, which regularly collects human sacrifices to Satan, in fact hosts for system lord Sokar's army. When Simon implores SG-1 to spare his beloved Mary and take him instead, they even nurse her chicken pox. Simon hopes they are sent by God to deliver them from the satanic burden, but the canon who rules the village as 'spiritual' leader faithful to Sokar fears his authority challenged, which rests on his right to select the 'damned soul' to be sacrificed, ...