Ladon, a Genii scientist who was involved with the Genii’s attempt to capture Atlantis (S1E11: The Eye), contacts the SGA team to coerce them into helping him overthrow the Genii government he had been serving. His enticement is a zero point module that he has in his possession. The team decides it is worth risking the uneasy truce between the SGA and the Genii to acquire the ZPM. But, can they trust Ladon to keep his promise? Strangely, the SGA team finds they have their own ace card to play, when things start to go horribly wrong.
To make matters worse, Maj. Lorne has gone missing while on an away mission. Telya and Ronon are sent to try and find out what happened to him.