On an unexplored planet, Sheppard, McKay, Teyla and Ronon hike into a village at dusk. The startled inhabitants insist that they spend the night. Apparently, after darkness falls, a mysterious killer stalks the area, sucking the life from its victims. Sheppard and his team instantly guess what they're dealing with: a Wraith.

When Atlantis's deep-space sensors detect the Aurora, an ancient Atlantian warship, at the edge of the galaxy, Sheppard's team wastes no time hitching a ride to it aboard the Daedalus. Upon their arrival, they encounter a Wraith scout ship. They destroy the scout before it can cause trouble — or so they hope.