The Light (S04E18)

One member of an SG unit has committed suicide, and three others, including Dr. Daniel Jackson, are near death. Their condition is a mystery, but the answer could well lie in a strange offworld temple. Col. Jack O'Neill, Maj. Samantha Carter and Teal'c check out the site and discover a room with a mesmerizing light display. They conclude that the temple was, at one point, a Goa'uld pleasure palace. As their investigation progresses, they come to realize that the temple is directly affecting their brains' physiologies — delivering euphoric highs while they are on its premises, and debilitating lows of withdrawal when they attempt to leave. Trapped, they must find a way to break this otherworldly addiction. A young man who is seemingly unaffected by the strange environment might hold the key to their salvation. (Metro-Goldwyn-Mayer (MGM))