20 episodesFirst aired 15 July 2004
The Atlantis expedition team, led by Dr. Elizabeth Weir, arrives in the Pegasus Galaxy and discovers the lost city of Atlantis. They encounter a powerful new enemy, the Wraith, and face various challenges to protect their new home while exploring the galaxy and seeking new allies.
E1Jul 200445m
A new Stargate team embarks on a dangerous mission to a distant galaxy, where they discover a mythical lost city -- and a deadly new enemy.
E2Jul 200441m
Sheppard tries to convince Weir to mount a rescue mission to free Colonel Sumner, Teyla, and the others captured by the Wraith.
E3Jul 200444m
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.
E4Jul 200444m
The team finds themselves in mortal danger when their Puddle Jumper ship becomes lodged in the Stargate.
E5Aug 200448m
After a series of run-ins with the Wraith, the team begins to suspect their Athosian allies of having a spy in their midst.
E6Aug 200444m
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.
E7Aug 200442m
The team finds a world whose people are on the brink of a discovery that may make them immune to the Wraith feeding.
E8Aug 200444m
Efforts to open trade relations with a species called the Genii turn sour when the team discovers their new "allies" have ulterior motives.
E9Sept 200442m
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.
E10Sept 200442m
When a massive storm threatens the city, Atlantis is evacuated, only to be taken over by the team's newest enemy.
E11Nov 200442m
Major Sheppard plays a dangerous game of cat and mouse with soldiers who have seized control of Atlantis and taken Weir and McKay hostage.
E12Nov 200442m
Sheppard's team investigates a downed Wraith ship, and find themselves stuck on a planet with a lone Wraith survivor.
E13Nov 200442m
Nearly a third of Atlantis's residents are infected with a deadly virus that causes hallucinations and death, forcing a lockdown of the city.
E14Nov 200444m
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.
E15Dec 200442m
A woman is found in suspended animation in Atlantis, and the team is shocked to see that it is Dr. Weir herself, who tells them of her trip 10,000 years into the city's past.
E16Jan 200544m
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.
E17Jan 200544m
Given a brief opportunity to send a data transmission to Earth, members of the Atlantis expedition compose video messages home to their loved ones.
E18Jan 200542m
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.
E19Jan 200544m
With a group of Wraith hive ships on the way to Atlantis, the team searches for a place to flee and a way to destroy the city. McKay leads a team to try and activate the Ancients' orbital weapons platform.
E20Jan 200544m
All hope seems lost, until Colonel Everett arrives suddenly from Earth. He is determined to defend the city until the arrival of a ZPM, brought by a new ship.
