Ronon once again comes face-to-face with Tyre, one of his people who became a Wraith worshiper – but who now claims he has broken free of their influence.
Teyla goes in disguise as a Wraith queen when Todd agrees to make a bold proposal to the leader of his alliance – not realizing that he has other intentions.
When Daniel Jackson visits Atlantis, he and Dr. McKay discover a hidden lab that brings a new enemy knocking. The Daedalus welcomes a Wraith ally for a special project.
Sheppard races to an Ancient laboratory to save McKay and Daniel Jackson before Todd arrives to destroy a weapon that has a devastating side-effect. Daniel uncovers the identity of the hostile new species.
The Wraith arrive in a village where Dr. Beckett is working, and demand that the locals turn over a group of refugees who survived the Hoffan plague – or the entire village will be obliterated.
While being evaluated by the I.O.A. Richard Woolsey meets a beautiful scientist new to Atlantis, who is not what she appears. Sheppard is captured and tortured by an enemy he thought was dead.
Rodney returns to Earth with Jennifer to witness the triumph of his rival, who believes he has solved the problem of global warming. But when the new technology goes horribly awry, Rodney must help shut down the deadly weather device.
After Todd's hive ship shows up over Atlantis transmitting a distress call, the team discovers that he and his crew have been stricken with a disease they helped create.
