Major Lorne investigates a planet where one civilization has pictures of McKay, and SGA soon realizes it is connected to an Atlantis control room that McKay and Sheppard had found and thought was just a game room. SGA soon realizes the game room was really an experimental Ancient control room which controls the planet. McKay and Sheppard find that their war game has been affecting the real people on the planet for the last few years. Now Sheppard and McKay must convince both sides that their planet’s struggle was a mistake that they both mistakenly caused. However, they soon learn that they may have led these people into all out war with the technology they mistakenly provided.