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Season guide

Stargate Atlantis: Season 3

20 episodes Premiered Jul 13, 2006
Previously on Stargate Atlantis

Season 3 Lore Primer

Key plot threads, lore context, and character stakes you need to remember before diving into this season.

  • Directly follows the overarching narrative developments of Stargate Atlantis Season 2.
  • Faction dynamics and core character alliances shift under escalating external stakes.
  • Crucial mysteries introduced previously reach key turning points and narrative reckonings.
  • Sets up serialized story arcs that build directly toward the climactic season finale.
Season 3 Episodes

Episode Guide

🛡️ SPOILER SHIELD

Season 3 Progress Shield

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Binge Efficiency Engine

Season 3: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

20%
80%
Mytharc (4): Crucial lore & season climaxes
Core (16): Character development & subplots
Side Quest (0): Standalone / filler
S3·E1 Mytharc

No Man's Land (2)

Jul 13, 2006

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·E2 Core

Misbegotten (3)

Jul 20, 2006

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·E3 Core

Irresistible

Jul 27, 2006

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·E4 Core

Sateda

Aug 3, 2006

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·E5 Core

Progeny

Aug 10, 2006

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·E6 Core

The Real World

Aug 17, 2006

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·E7 Core

Common Ground

Aug 24, 2006

Colonel Sheppard finds himself the prisoner of a Genii commander, along with a desperately hungry Wraith who has been separated from his hive.

S3·E8 Core

McKay and Mrs. Miller

Sep 7, 2006

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·E9 Core

Phantoms

Sep 14, 2006

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

S3·E10 Core

The Return (1)

Sep 21, 2006

The Atlantis expedition is stunned to learn that a ship full of Ancients is returning to reclaim their lost city.

S3·E11 Core

The Return (2)

Nov 19, 2006

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·E12 Core

Echoes

Nov 26, 2006

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·E13 Core

Irresponsible

Dec 3, 2006

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

S3·E14 Core

Tao of Rodney

Dec 10, 2006

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·E15 Core

The Game

Dec 17, 2006

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·E16 Core

The Ark

Jan 7, 2007

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

S3·E17 Mytharc

Sunday

Jan 11, 2007

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·E18 Core

Submersion

Jan 14, 2007

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·E19 Mytharc

Vengeance

Jan 28, 2007

The Atlantis team investigates the disappearance of one of their allies, only to find an old enemy engineering a race of powerful monsters.

S3·E20 Mytharc

First Strike (1)

Feb 4, 2007

An unstoppable energy weapon leaves Atlantis under siege after Earth launches a preemptive attack against a very powerful enemy's homeworld.