Sheppard and the team visit a world where no one is over 24 years old -- because of a ritual suicide practice they believe keeps the Wraith at bay.

The team finds Lucius Lavin manipulating the people of another hapless planet, using Ancient technology to pose as an invincible hero.

Sheppard's team meets an obnoxious man who is adored by all thanks to a secret that he carries -- and who has an unexpected effect on them.

Plagued by terrifying nightmares, Teyla begins to recall a time when she and her father were captured by the Wraith and subjected to disturbing experiments.

Elizabeth Weir wakes up in a mental institution, where she is told that the expedition to Atlantis and the Stargate are figments of her imagination.

Lt. Colonel John Sheppard's team is invited by the Coalition of Planets in order to form an alliance. However, the team is misled and is faced to stand trial, for their alleged crimes against the Pegasus galaxy. Their best chance of freedom, is the experiences of Richard Woolsey.

Colonel Sheppard and Dr. McKay must protect a child princess on a pilgrimage before she can become queen, and learn that she has dangerous enemies threatening her life.

Sheppard and Ronon are influenced by a mind-altering device created by the Wraith while on a mission to rescue a lost team.

Ronon Dex is captured by Tyre, who wants to hand him to the Wraith in order to maintain his role in their circle. However, when the deal turns sour, and Tyre is left for dead, the Atlantis expedition persuade him to take back their friend. Meanwhile, The Wraith turn Ronon into a Wraith worshipper.

The Atlantis base is threatened when the team discovers that an alien entity is in the city. McKay's experiment with alien technology goes awry.

After a series of run-ins with the Wraith, the team begins to suspect their Athosian allies of having a spy in their midst.

McKay's efforts to harness the energy of an alien planet's atmosphere allows for a return trip to Earth -- but the team may not be able to return to Atlantis.

During a visit to New Athos, Teyla and Dr. Keller find themselves on the run from a primitive tribe of warriors.

The team finds themselves in mortal danger when their Puddle Jumper ship becomes lodged in the Stargate.

Efforts to open trade relations with a species called the Genii turn sour when the team discovers their new "allies" have ulterior motives.

Nearly a third of Atlantis's residents are infected with a deadly virus that causes hallucinations and death, forcing a lockdown of the city.

The team finds a world whose people are on the brink of a discovery that may make them immune to the Wraith feeding.

The team finds a paradise world that would make an ideal sanctuary for those fleeing from the Wraith, but the local inhabitants believe their goddess will not permit it.

The team searches for a valuable Zero Point Module rumored to be hidden on the planet Dagan -- but their new allies have motives of their own.

The Daedalus is infected by a Wraith computer virus, while members of the expedition hope to return to Earth.

The team discovers two pods that contain the minds of alien beings, who take control of Weir and Sheppard's bodies to continue their personal war.

The Atlantis team must decide the fate of a colony of Wraith they have turned into humans. Dr. Weir must defend her leadership when she is evaluated by the I.O.A.

The team discovers the last of a civilization in suspended animation, whose survival is at risk when their station is critically damaged.

While on personal leave on Earth, Sheppard and Ronon learn that scientists have engineered a human-form Replicator -- who is now on the loose.

While on a mission, Lt. Colonel John Sheppard's team inadvertently brings a mysterious entity to Atlantis. They soon learn that the entity is nothing more than Dr. Elizabeth Weir, who was thought to have been killed after her capture by the Asurans.