Seasons & episodes
S4 · E1Adrift (2) 2007-09-27 · 44 min
Floating in deep space with the city's protective shield failing, the team must do all they can to keep Atlantis alive. A radical injury threatens Dr. Weir's life.
S4 · E2Lifeline (3) 2007-10-04 · 43 min
Colonel Sheppard and his team embark on a risky mission to steal a Z.P.M. power module from the Replicators -- but must rely on a compromised Dr. Weir to succeed.
S4 · E3Reunion 2007-10-11 · 44 min
When a group of Ronon's people enlist the team's help in raiding a Wraith weapons facility, Ronon reconsiders whether his future lies in Atlantis or with his friends.
S4 · E4Doppelganger 2007-10-18 · 43 min
During an off-world mission Colonel Sheppard unknowingly becomes host to an alien entity, which infects others in Atlantis and afflicts them with terrifying nightmares.
S4 · E5Travelers 2007-10-25 · 43 min
Colonel Sheppard is captured by the inhabitants of a generational ship and their beautiful leader, who wish to use his ability to use Ancient technology for their own ends.
S4 · E6Tabula Rasa 2007-11-01 · 44 min
When a virus causes amnesia in everyone except Teyla and Ronon, the Atlantis team must work together to find a cure before their memories fade entirely.
S4 · E7Missing 2007-11-08 · 44 min
During a visit to New Athos, Teyla and Dr. Keller find themselves on the run from a primitive tribe of warriors.
S4 · E8The Seer 2007-11-15 · 44 min
The team meets a man with extraordinary prophetic abilities, who gives them a dark prediction about Atlantis's future. The Wraith seek a new alliance with Atlantis in their war with the Replicators.
S4 · E9Miller's Crossing 2007-11-29 · 44 min
Rodney McKay goes in search of his sister on Earth after she is kidnapped by the head of a powerful corporation.
S4 · E10This Mortal Coil (1) 2007-12-06 · 44 min
A mysterious drone crashes into Atlantis, indicating that the Replicators may have found the city. But when Elizabeth Weir appears, the team realizes that the probe is just a part of a bigger mystery.
S4 · E11Be All My Sins Remember'd (2) 2008-01-03 · 44 min
With a plan to potentially extinguish the Replicator threat, the Atlantis team must seek an alliance with a fleet of Wraith ships.
S4 · E12Spoils of War 2008-01-10 · 44 min
The team finds their former Wraith ally's hive ship drifting in space, which leads them to a secret project that could turn the tide of a civil war.
S4 · E13Quarantine 2008-01-17 · 44 min
An automated lockdown traps Atlantis personnel in various parts of the city, each of them hoping the others will come to their rescue.
S4 · E14Harmony 2008-01-24 · 44 min
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.
S4 · E15Outcast 2008-01-31 · 43 min
While on personal leave on Earth, Sheppard and Ronon learn that scientists have engineered a human-form Replicator -- who is now on the loose.
S4 · E16Trio 2008-02-07 · 44 min
McKay, Carter, and Keller are trapped in an underground chamber while on an off-world mission, with no apparent means of escape.
S4 · E17Midway 2008-02-14 · 44 min
Teal'c visits Atlantis to counsel a headstrong Ronon, who is up for review by the I.O.A. But the two must work together when the Wraith invade the Midway space station in order to reach Earth.
S4 · E18The Kindred (1) 2008-02-21 · 44 min
As a mysterious new illness sweeps through the Pegasus Galaxy, Teyla is convinced by a vision that the father of her child is trying to communicate with her.
S4 · E19The Kindred (2) 2008-02-28 · 44 min
The team is shocked when an old friend, believed to be dead, miraculously returns to them. Teyla plans an escape from Michael's captivity.
S4 · E20The Last Man (1) 2008-03-06 · 44 min
Sheppard returns to Atlantis after a mission and finds the city abandoned, all systems dead -- and instead of ocean, sand dunes as far as the eye can see.