Season 4
20 episodes · Sep 27, 2007
With changes in leadership and new allies, the team continues to battle the Wraith and confront new existential threats. Personal dynamics shift as members struggle with loss and make significant choices that shape the fate of Atlantis and its mission in the Pegasus Galaxy.
0/20 watched
Swipe a row to mark watched · long-press to mark up to there
S4E1Adrift (2)
Sep 27, 200744mFloating 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.
S4E2Lifeline (3)
Oct 4, 200743mColonel 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.
S4E3Reunion
Oct 11, 200744mWhen 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.
S4E4Doppelganger
Oct 18, 200743mDuring an off-world mission Colonel Sheppard unknowingly becomes host to an alien entity, which infects others in Atlantis and afflicts them with terrifying nightmares.
S4E5Travelers
Oct 25, 200743mColonel 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.
S4E6Tabula Rasa
Nov 1, 200744mWhen 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.
S4E7Missing
Nov 8, 200744mDuring a visit to New Athos, Teyla and Dr. Keller find themselves on the run from a primitive tribe of warriors.
S4E8The Seer
Nov 15, 200744mThe 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.
S4E9Miller's Crossing
Nov 29, 200744mRodney McKay goes in search of his sister on Earth after she is kidnapped by the head of a powerful corporation.
S4E10This Mortal Coil (1)
Dec 6, 200744mA 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.
S4E11Be All My Sins Remember'd (2)
Jan 3, 200844mWith a plan to potentially extinguish the Replicator threat, the Atlantis team must seek an alliance with a fleet of Wraith ships.
S4E12Spoils of War
Jan 10, 200844mThe 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.
S4E13Quarantine
Jan 17, 200844mAn automated lockdown traps Atlantis personnel in various parts of the city, each of them hoping the others will come to their rescue.
S4E14Harmony
Jan 24, 200844mColonel 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.
S4E15Outcast
Jan 31, 200843mWhile on personal leave on Earth, Sheppard and Ronon learn that scientists have engineered a human-form Replicator -- who is now on the loose.
S4E16Trio
Feb 7, 200844mMcKay, Carter, and Keller are trapped in an underground chamber while on an off-world mission, with no apparent means of escape.
S4E17Midway
Feb 14, 200844mTeal'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.
S4E18The Kindred (1)
Feb 21, 200844mAs 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.
S4E19The Kindred (2)
Feb 28, 200844mThe team is shocked when an old friend, believed to be dead, miraculously returns to them. Teyla plans an escape from Michael's captivity.
S4E20The Last Man (1)
Mar 6, 200844mSheppard 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.