| Image
| Title
| Number
| Airdate
| Planet(s)
| Race(s)
| Enemies
|
| "Adrift (Part 2 of 3)"
| 401
| September 28, 2007
| M12-578
| N/A
| N/A
|
| With only 24 hours of power left, Atlantis drops out of hyperspace and is helplessly drifting through space with the Atlantis Expedition tirelessly working on a way to save the city. However, with Weir injured and several obstacles on the way, it may not be easy.
|
| "Lifeline (Part 3 of 3)"
| 402
| October 5, 2007
| Asuras, M35-117
| Asuran
| Oberoth
|
| John Sheppard and his team use Elizabeth Weir to perform a daring operation to infiltrate the Replicator homeworld, to steal a much needed ZPM to power Atlantis and go to their new home. In the same time, the Apollo continues to search for the lost city.
|
| "Reunion"
| 403
| October 12, 2007
| Earth, M35-117
| Satedan, Wraith
| Ara, Rakai, Tyre
|
| Ronon Dex reunites with his long-thought dead Satedan friends, who wants help in breaking into a Wraith lab. However, a torn Ronon is soon pushed by his friends to abandon the Atlantis Expedition and join them, but there is something more than meets the eye. Meanwhile, Samantha Carter is appointed the new leader of the Expedition.
|
| "Doppelganger"
| 404
| October 19, 2007
| M35-117, M3X-387
| Crystal of M3X-387
| Crystal of M3X-387
|
| After coming across a crystalline species similar to one that Jack O'Neill encountered ten years ago, Sheppard inadvertently carries its entity back to Atlantis. As it moves into other members, it's bent on destroying them in nightmares in the form of Sheppard, increasing in severity for each case.
|
| "Travelers"
| 405
| October 26, 2007
| M35-117
| Traveler, Wraith
| Wraith Commander
|
| John Sheppard is captured by a never-heard-before race of technologically advanced Humans known as Travelers, who brought him to help activate a dormant Aurora class warship to help resolve the population problems faced with the race's limited number of ships, only to be chased after by Wraith. Meanwhile, the rest of his team tries to find him.
|
| "Tabula Rasa"
| 406
| November 2, 2007
| M35-117
| N/A
| N/A
|
| A mysterious illness causes everyone in the Atlantis Expedition to lose their memories, which will soon kill them all. However, Ronon Dex and Teyla Emmagan haven't been infected, and the fate of the city truly rests on their hands as they try to convince the team to save themselves.
|
| "Missing"
| 407
| November 9, 2007
| M35-117, New Athos
| Bolo Kai
| Omal, Nabel Golan
|
| Teyla Emmagan and Jennifer Keller go to the new Athosian settlement on New Athos on a routine medical check-up. However, when they arrive, they find the Athosians missing, with a tribe of warriors taking their place. With no way to contact Atlantis, the couple is to survive the night while searching for clues as to what happened to the Athosians.
|
| "The Seer"
| 408
| November 16, 2007
| M2R-441, M35-117, Vedeena
| Wraith, Vedeenan
| N/A
|
| The Atlantis Expedition find a man named Davos, who can somehow see into the future. Teyla hopes to use him to find the missing Athosians. Richard Woolsey performs a three-month evaluation on Carter, while an old Wraith acquaintance from Sheppard's past comes back, who gives him some disturbing news about the development of the war with the Replicators.
|
| "Miller's Crossing"
| 409
| November 30, 2007
| Earth, M35-117
| Wraith
| Henry Wallace
|
| Rodney McKay's sister, Jeannie Miller is kidnapped by Henry Wallace, who wants her to rewrite nanite coding to save his daughter's life. McKay's attempts to rescue happens to get him captured as well. They must work on the nanite coding if they're to be released, while McKay's team tries to find them.
|
| "This Mortal Coil (Part 1 of 3)"
| 410
| December 7, 2007
| Asuras, M34-227, M35-117, Niam's faction's planet
| Asuran
| Oberoth
|
| When a mysterious drone crashes into Atlantis, Sheppard and his team suspect the Asurans have found them, yet when they investigate, certain people want to stop them from finding the truth. And yet, stranger still, Elizabeth Weir returns to Atlantis out of nowhere.
|
| "Be All My Sins Remember'd (Part 2 of 3)"
| 411
| January 4, 2008
| Asuras, M35-117
| Asuran, Traveler, Wraith
| Asurans
|
| With the Asurans undeterred in their effort to wipe out Human populations to defeat the Wraith, the Atlantis Expedition now have a means of tracking their ships and destroy them using the newly acquired plasma beam weapons on their ships. However, their efforts mean that the Asurans have to retreat to their homeworld, only to come back again in bigger numbers. In order to stop them, the Atlantis Expedition, Wraith and the recently discovered Travelers must work together to stop the Asurans once and for all.
|
| "Spoils of War (Part 3 of 3)"
| 412
| January 11, 2008
| Asuras, M35-117, Unnamed
| Wraith
| Wraith Queen
|
| The Atlantis Expedition encounter a partially damaged WraithHive Ship after their successful battle against the Asurans. They are also able to retrieve valuable data to use against the Wraith, including a Wraith cloning facility, but in order to get the information, they are to use a impregnated Teyla Emmagan, despite the fact that ColonelJohn Sheppard pulled her off the team.
|
| "Quarantine"
| 413
| January 18, 2008
| M35-117
| N/A
| N/A
|
| A quarantine lockdown leaves everyone in Atlantis trapped, threatening several relationships in the progress. However, some of the team learns that the quarantine lockdown might be nothing more than a false alarm, but it does not matter, as the entire city could be threatened.
|
| "Harmony"
| 414
| January 25, 2008
| Harmony's planet
| Genii
| Toran
|
| Rodney McKay and John Sheppard are on a familiar planet for trade, where their royal family ask them to escort a young princess, Harmony through the forest to some ruins, where she will become Queen. However, on the way, they discover that a Genii contingent is tracking Harmony down, by the orders of one of Harmony's own sisters.
|
| "Outcast"
| 415
| February 1, 2008
| Earth, M35-117
| Human form Replicator
| Poole's Replicator
|
| When John Sheppard's father dies, he and Ronon Dex attend his wake, where the two are confronted by Ava Dixon, and informs them she worked with nanotechnology, and a scientist has illegally created a Replicator, that is now loose on Earth. Dixon needs their help in tracking it down.
|
| "Trio"
| 416
| February 8, 2008
| M35-117, M5V-801
| N/A
| N/A
|
| While on a mission to evacuate a planet prone to earthquakes, Samantha Carter, Jennifer Keller and Rodney McKay end up trapped in an abandoned, underground mine left behind by the Genii. While trying their escape, the three try to get to know each other better.
|
| "Midway"
| 417
| February 15, 2008
| M35-117, M4F-788
| Jaffa, Wraith
| Wraith Commander
|
| Teal'c arrives in Atlantis to teach Ronon Dex on how to deal with IOA interviews. At first, the two don't get along, but have to work together, when they learn that the Wraith have figured out a way to infiltrate the Midway space station, and ultimately, Earth.
|
| "The Kindred (Part 1 of 2)"
| 418
| February 22, 2008
| Hoff, M2S-181, M35-117
| Athosian, Hybrid, Wraith
| Michael Kenmore
|
| While the Atlantis Expedition investigates a mysterious plague across completely random worlds, Teyla Emmagan receives visions on some clues about the whereabouts of the Athosians, and who took them.
|
| "The Kindred (Part 2 of 2)"
| 419
| February 29, 2008
| M35-117, Unnamed
| Athosian, Hybrid
| Michael Kenmore
|
| Carson Beckett, thought to have been killed a year ago, suddenly appears in front of Sheppard's team's eyes, where he is soon revealed to be a clone created by Michael Kenmore and was held as his prisoner. Cloned Beckett convinces the team to rescue Teyla Emmagan, who has also been held prisoner by Michael. Meanwhile, Teyla is finally reunited with the missing Athosians.
|
| "The Last Man (Part 1 of 2)"
| 420
| March 7, 2008
| M2S-445, M35-117, M4S-587
| Hybrid
| Michael Kenmore
|
| While searching for Teyla Emmagan, John Sheppard gates to Atlantis, where he discovers he accidentally traveled 48,000 years into the future in an abandoned Atlantis, with deserts replacing the ocean. A hologram of Rodney McKay comes up and gives him a chance to get back to the present, to prevent a future in which everyone dies.
|
