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Season guide

Stargate Atlantis: Season 2

20 episodes Premiered Jul 15, 2005
Previously on Stargate Atlantis

Season 2 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 1.
  • 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 2 Episodes

Episode Guide

🛡️ SPOILER SHIELD

Season 2 Progress Shield

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Binge Efficiency Engine

Season 2: Filler vs. Essential Canon

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

15%
85%
Mytharc (3): Crucial lore & season climaxes
Core (17): Character development & subplots
Side Quest (0): Standalone / filler
S2·E1 Mytharc

The Siege (3)

Jul 15, 2005

The Daedalus arrives to defend Atlantis from the Wraith onslaught, but it may not be enough when the team discovers that an even larger armada is on the way.

S2·E2 Core

The Intruder

Jul 22, 2005

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

S2·E3 Core

Runner

Jul 29, 2005

Sheppard and his team attempt to locate Lieutenant Ford, only to find themselves captives of a former soldier who is being hunted by the Wraith.

S2·E4 Core

Duet

Aug 5, 2005

A run-in with a Wraith Dart leaves the consciousness of a precocious Atlantis security officer trapped in Dr. McKay's mind.

S2·E5 Core

Condemned

Aug 12, 2005

The Atlantis team finds a culture that lives in relative safety from the Wraith, because they hand over their criminals to the Wraith -- and crash-land in the volatile penal colony

S2·E6 Core

Trinity

Aug 19, 2005

McKay puts the team at risk when he tries to perfect unfinished Ancient technology that wiped out a civilization. Ronon Dex discovers that he is not the lone survivor from his worl

S2·E7 Core

Instinct

Aug 26, 2005

The team discovers a young Wraith girl who has been raised by a human, and is in hiding from the people of her human village in fear of her life.

S2·E8 Core

Conversion

Sep 9, 2005

Colonel Sheppard begins to undergo a disturbing physical transformation after being exposed to Beckett's anti-Wraith drug.

S2·E9 Core

Aurora

Sep 23, 2005

When the team finds an Ancient warship adrift on the edge of the galaxy, its crew still alive, Colonel Sheppard enters their virtual reality stasis to communicate with them.

S2·E10 Core

The Lost Boys (1)

Sep 23, 2005

The team is captured by the missing Lieutenant Ford, who is now leading a group of young men who are taking the Wraith enzyme -- and who wants the team's help in a suicide attack a

S2·E11 Core

The Hive (2)

Nov 16, 2005

Colonel Sheppard and his team find themselves prisoners of the Wraith following Ford's attack on a hive ship. Dr. McKay goes to great lengths to help them.

S2·E12 Core

Epiphany

Nov 28, 2005

Sheppard finds himself on a planet where time passes more rapidly, with no way to contact his team or return to Atlantis.

S2·E13 Core

Critical Mass

Dec 5, 2005

When an operative of the Trust plants a bomb in Atlantis, the team must find a spy within their own ranks before the Wraith arrive and discover the city.

S2·E14 Core

Grace Under Pressure

Dec 10, 2005

When Dr. McKay is trapped underwater in a sinking Puddle Jumper, his only chance for survival may be an hallucination of Samantha Carter.

S2·E15 Core

The Tower

Dec 19, 2005

The team finds a world that possesses Ancient defense technology, where Colonel Sheppard finds himself a pawn in the rivalry between the heirs to the throne.

S2·E16 Core

The Long Goodbye

Jan 2, 2006

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.

S2·E17 Core

Coup D'etat

Jan 9, 2006

After a team from Atlantis goes missing, the expedition finds itself in the middle of a Genii coup.

S2·E18 Core

Michael

Jan 16, 2006

An amnesiac young Lieutenant in Atlantis suffers from disturbing nightmares that he is a Wraith, only to make a shocking discovery about himself.

S2·E19 Mytharc

Inferno

Jan 23, 2006

Sheppard's team meets a civilization about to be destroyed by a super-volcano, and is trapped there when the Stargate is destroyed during the evacuation.

S2·E20 Mytharc

Allies (1)

Jan 30, 2006

Michael and his Wraith faction arrive at Atlantis to propose an alliance, hoping to use the retrovirus to transform their Wraith enemies into prey.