The team faces escalating conflicts with both old and new adversaries, including the Wraith and a deadly new faction. The discovery of a potential game-changing technology introduces new ethical dilemmas, while relationships within the team are tested under growing pressures.
All episodes — Season 3
S3 E1No Man's Land (2)
Jul 13, 20068.443 min
The team desperately attempts to stop two Wraith hive ships from reaching Earth. Sheppard must rely on an old foe to rescue McKay and Ronon.
S3 E2Misbegotten (3)
Jul 20, 20067.644 min
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.
S3 E3Irresistible
Jul 27, 20066.642 min
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.
S3 E4Sateda
Aug 3, 2006842 min
Ronon Dex is captured by the Wraith and returned to his homeworld, where he is haunted by his past as he is forced to once again become their prey.
S3 E5Progeny
Aug 10, 20067.944 min
Weir and the team visit an advanced civilization that split off from the Lanteans thousands of years ago, but discover that they may not have left Atlantis in peace.
S3 E6The Real World
Aug 17, 2006742 min
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.
S3 E7Common Ground
Aug 24, 20068.542 min
Colonel Sheppard finds himself the prisoner of a Genii commander, along with a desperately hungry Wraith who has been separated from his hive.
S3 E8McKay and Mrs. Miller
Sep 7, 20068.444 min
Rodney McKay is reunited with his estranged sister back on Earth, who has given up a brilliant career as a scientist to raise a family.
S3 E9Phantoms
Sep 14, 20067.542 min
Sheppard and Ronon are influenced by a mind-altering device created by the Wraith while on a mission to rescue a lost team.
S3 E10The Return (1)
Sep 21, 20068.142 min
The Atlantis expedition is stunned to learn that a ship full of Ancients is returning to reclaim their lost city.
S3 E11The Return (2)
Nov 19, 20068.342 min
The Atlantis team goes against orders to try and save Atlantis from Replicator control -- and to rescue General O'Neill and Richard Woolsey, who are trapped in the occupied city.
S3 E12Echoes
Nov 26, 20067.642 min
The inhabitants of Atlantis begin to suffer ill effects when the planet's whale population begins migrating to the island city, bringing an unexpected harbinger of doom.
S3 E13Irresponsible
Dec 3, 20066.842 min
The team finds Lucius Lavin manipulating the people of another hapless planet, using Ancient technology to pose as an invincible hero.
S3 E14Tao of Rodney
Dec 10, 20068.343 min
After an Ancient device gives Rodney superhuman powers, his enhanced brilliance is checked only by his impending death -- unless he can learn how to ascend.
S3 E15The Game
Dec 17, 20067.742 min
Sheppard and McKay discover that their competitive video game has been controlling a planet of real people, who now stand on the brink of war.
S3 E16The Ark
Jan 7, 20077.342 min
The team discovers the last of a civilization in suspended animation, whose survival is at risk when their station is critically damaged.
S3 E17Sunday
Jan 11, 2007842 min
The team tries to relax during a mandatory day off, until an explosion leaves three people dead -- and reveals that one scientist is a walking time bomb.
S3 E18Submersion
Jan 14, 20077.642 min
The team discovers an Ancient drilling station deep beneath the surface of the ocean, only to find that a Wraith queen is still alive there.
S3 E19Vengeance
Jan 28, 20077.644 min
The Atlantis team investigates the disappearance of one of their allies, only to find an old enemy engineering a race of powerful monsters.
S3 E20First Strike (1)
Feb 4, 20078.542 min
An unstoppable energy weapon leaves Atlantis under siege after Earth launches a preemptive attack against a very powerful enemy's homeworld.