List of Stargate Atlantis episodes

This article provides the list of episodes from the television series Stargate Atlantis.

See Stargate for information on the Stargate fictional universe, Stargate Atlantis for information on the series itself and the List of Stargate SG-1 episodes for the Stargate SG-1 series.

The first three seasons of Stargate Atlantis are currently available for purchase on DVD in the USA, Australia, New Zealand,Canada, the United Kingdom, and Ireland. The first two seasons are available on DVD in Germany. The series was renewed for a fourth season in August 2006, which began airing in the United States and Canada on September 28, 2007, on the Sci Fi Channel. A fifth season has been planned and approved for production.

As of February 15, 2008, 77 episodes have been aired.

Season 1

The Lost City will rise again. The series picks up the story arc from Stargate SG-1's Lost City, where people from all around the world come together to form an expedition and discover the wonders of Atlantis. Discovering that they have been cut off from Earth, they must fend for themselves, and discover a powerful new enemy bent on human subjugation.

#	#	Title	Written by	Directed by	Original airdate
1	101	"Rising (Part 1)"	Robert C. Cooper and Brad Wright	Martin Wood	July 16, 2004 (Sci Fi Channel)
After relinquishing her position at Stargate Command, Dr. Elizabeth Weir has been working in the Antarctic Outpost, gathering members of an expedition to embark to the lost city of Atlantis. When they seem to be able to ascertain a gate address, a new adventure begins. (This episode was nominated for a Leo Award in the category "Dramatic Series: Best Production Design".)
2	102	"Rising (Part 2)"	Robert C. Cooper and Brad Wright	Martin Wood	July 16, 2004 (Sci Fi Channel)
After Sheppard's return with refugees from Athos, Atlantis, moments away from being crushed, breaks away from the ocean floor, rising to the surface just before the shield fails. Now, given a chance to rescue his people, Sheppard needs to make Weir see things his way.
3	103	"Hide and Seek"	Robert C. Cooper and Brad Wright	David Warry-Smith	July 23, 2004 (Sci Fi Channel)
Eager to experiment with new technology, Dr. McKay volunteers to be Dr. Beckett's first patient for his new ATA gene therapy. Able to use this device, McKay recklessly tests its properties, only to find that it could lead to his death. Elsewhere, an entity threatens the city.
4	104	"Thirty-Eight Minutes"	Brad Wright	Mario Azzopardi	July 30, 2004 (Sci Fi Channel)
Needing medical attention, Sheppard's puddle jumper races to Atlantis, only to become lodged in the Stargate. Now, they only have 38 minutes until the stargate automatically dis-engages, and the jumper gets cut in two... leaving them to suffocate in outer space.
5	105	"Suspicion"	Paul Mullie & Joseph Mallozzi	Mario Azzopardi	August 6, 2004 (Sci Fi Channel)
When the offworld teams are attacked one time too many, Dr. Weir must consider that there is an Athosian spy in their midst, but upon further investigation, is ordered, all evidence points to Teyla. Feeling betrayed, the Athosians resettle to the newly-discovered mainland.
6	106	"Childhood's End"	Martin Gero	David Winning	August 13, 2004 (Sci Fi Channel)
The team visits a world where no one is over 24 years old, because of ritual suicides they believe keep the Wraith at bay. Unbeknownst to them, the Wraith can't attack due to an EM field that renders all technology useless, until the team unwittingly takes the ZPM powering it.
7	107	"Poisoning the Well"	Damian Kindler	David Winning	August 20, 2004 (Sci Fi Channel)
Maj. Sheppard volunteers Beckett to help the Hoffans, an advanced human culture who are developing a vaccine against the Wraith. But the Hoffans are willing to go to any extreme to eliminate their enemy, even if it means the destruction of the majority of their people. (For this episode, Paul McGillion was nominated for a Leo Award in the category "Dramatic Series: Best Supporting Performance by a Male", and Allison Hossack was nominated for a Leo Award in the category "Dramatic Series: Best Supporting Performance by a Female".)
8	108	"Underground"	Peter DeLuise	Brad Turner	August 27, 2004 (Sci Fi Channel)
In order to keep the expedition fed, the team visits the Genii to trade for food. According to Teyla she believed them to be peaceful farmers, however, Sheppard and McKay find an underground bunker, letting them see the real face of the Genii.
9	109	"Home"	Joseph Mallozzi & Paul Mullie	Holly Dale	September 10, 2004 (Sci Fi Channel)
When Atlantis discovers a planet that will allow them to gate to Earth, they return under the guise they will be able to go back to the city, due to the new hyperdrive on the Prometheus. Yet when the engines explode, the team begins to question the mystery of their situation.
10	110	"The Storm (Part 1)"	Jill Blotevogel and Martin Gero	Martin Wood	September 17, 2004 (Sci Fi Channel)
Exploring the planet, Sheppard and Teyla discover colossal storm with the ability to crush the city in its current state. McKay and Zelenka think of a daring way to power up the shield, but it's no coincidence that The Genii invade the city at their weakest moment. (This episode was nominated for a Leo Award in the category "Dramatic Series: Best Overall Sound". David Nykl (Zelenka) was nominated for a Leo in the category "Dramatic Series: Best Supporting Performance by a Male".)
11	111	"The Eye (Part 2)"	Martin Gero	Martin Wood	November 8, 2004 (The Movie Network)
While Sheppard attempts to reclaim the city from the Genii, who still have Weir and McKay as hostages, the bulk of the storm is fast approaching. Now, the rest of the team must take drastic measures to help where ever they can, before there is nothing left to save. (This episode was nominated for a Gemini Award in the category "Best Visual Effects", was nominated for a Leo Award in the category "Dramatic Series: Best Picture Editing", and won a Leo Award in the category "Dramatic Series: Best Visual Effects".)
12	112	"The Defiant One"	Peter DeLuise	Peter DeLuise	November 15, 2004 (The Movie Network)
Sheppard and McKay lead two scientists, to survey an Ancient orbital defense platform discovered from the city's sensors. When they arrive via jumper, they find a Wraith distress beacon emanating from the nearest planet's surface... and are in for an unusual surprise. (For this episode, director Peter DeLuise was nominated for a Leo Award in the category "Dramatic Series: Best Direction" and in the category "Dramatic Series: Best Screenwriting".)
13	113	"Hot Zone"	Martin Gero	Mario Azzopardi	November 22, 2004 (The Movie Network)
Inspecting the city for storm damage, a party of scientists unleash a virus that causes hallucinations and eventually... death. Now, nearly a third of Atlantis' residents have been infected, forcing a lockdown. It's up to Sheppard to keep it from spreading, and eliminate it for good.
14	114	"Sanctuary"	Alan Brennert	James Head	November 29, 2004 (The Movie Network)
Searching a new planet, the Wraith find the team, only for them to be shot down by a mysterious weapon. On the surface, they find a primitive world that would make ideal sanctuary for those fleeing from the Wraith, but the inhabitants believe their goddess won't permit it.
15	115	"Before I Sleep"	Carl Binder	Andy Mikita	December 6, 2004 (The Movie Network)
While exploring the city, the team stumbles upon a stasis unit holding an extremely old woman, who they believe to be an Ancient. When they revive her, she claims to be Dr. Elizabeth Weir, and she has a story she's been waiting ten-thousand years to tell. (This episode was nominated for a Gemini Award in the category "Best Achievement in Make-Up".)
16	116	"The Brotherhood"	Martin Gero	Martin Wood	January 3, 2005 (The Movie Network)
The team searches for a Zero Point Module rumored to be hidden on the planet Dagan. In attempt to locate and excavate the ZPM, the team crosses paths with Kolya once more, but it's not the only thing to worry about when their new allies have motives of their own. (For this episode, writer Martin Gero was nominated in the category "Best Writing in a Dramatic Series".)
17	117	"Letters from Pegasus"	Carl Binder	Mario Azzopardi	January 10, 2005 (The Movie Network)
With the Wraith fast approaching to claim the city, Atlantis must somehow send a message back to Earth for a desperate attempt in survival. Meanwhile, Sheppard and Teyla go offworld to try to find more intel on the Wraith fleet, but end up with a few hitchhikers.
18	118	"The Gift"	Robert C. Cooper and Martin Gero	Peter DeLuise	January 17, 2005 (The Movie Network)
Plagued by terrifying nightmares, Teyla tries to dive into her past offworld, where she finds an abandoned Wraith lab. Bringing back the findings, Dr. Beckett makes a surprising discovery in her DNA makeup, leading to a possible way to gather information from their enemy.
19	119	"The Siege (Part 1)"	Martin Gero	Martin Wood	January 24, 2005 (The Movie Network)
McKay leads a team to activate the Ancients' orbital weapons platform to destroy the hive ships on the final stretch to the city. Meanwhile, the city's personnel are preparing for evacuation, when they discover the kamikaze dart pilot (The Brotherhood) has survived in the city.
20	120	"The Siege (Part 2)"	Joseph Mallozzi and Paul Mullie	Martin Wood	January 31, 2005 (The Movie Network)
As a response to the message the expedition sent, the SGC sends Atlantis reinforcements via ZPM. Now the Ancient power source is en route through the latest Earth battleship the Daedalus, and they need to hold out for four days, or Atlantis risks destruction.

Season 2

The story continues when the Daedalus arrives and renews the expedition's connection to Earth. This takes place alongside the Ori story arc in SG-1, and the Wraith become an even larger threat in the Pegasus Galaxy. But what they deal with in their second year might be more than they can handle, and Dr. Beckett's retrovirus is more trouble than it's worth.

#	#	Title	Written by	Directed by	Original airdate
21	201	"The Siege (Part 3)"	Martin Gero	Martin Wood	July 15, 2005 (Sci Fi Channel)
The timely arrival of the Daedalus, lead by Col. Steven Caldwell, saves Maj. Sheppard's life from a suicide bombing run, but it may not be enough to defeat the Wraith when more hive ships are on the way. Thankfully with the new ZPM, McKay might pull off another miracle.
22	202	"The Intruder"	Joseph Mallozzi & Paul Mullie	Peter DeLuise	July 22, 2005 (Sci Fi Channel)
Strange malfunctions begin to occur when members of the expedition return from a trip to Earth aboard the Daedalus. When things go too far, they discover that the ship has been infected by a Wraith virus, and now it has the instinct to stay alive, even if it means it has to kill.
23	203	"Runner"	Robert C. Cooper	Martin Wood	July 29, 2005 (Sci Fi Channel)
Following a lead on the whereabouts of Lt. Ford, Lt. Col. Sheppard and Teyla get captured by Ronon Dex, a man who they find out is a runner, hunted by the Wraith. When they offer to help, the team must face off against their old ally, and possibly gain a new one.
24	204	"Duet"	Martin Gero	Peter DeLuise	August 5, 2005 (Sci Fi Channel)
After the team witnesses the aftermath of a culling, a Wraith Dart suddenly appears. When it's shot down to preserve Atlantis' secret, they discover that their drastic measures have left the consciousness of a precocious female marine officer trapped in Dr. McKay.
25	205	"Condemned"	Sean Carley and Carl Binder	Peter DeLuise	August 12, 2005 (Sci Fi Channel)
Sheppard's team stumbles upon a technologically advanced society that purposely leaves their criminals on a penal colony near the Stargate, for the Wraith to discover them first. But after the prisoners shoot the jumper down, they discover things aren't so clear cut.
26	206	"Trinity"	Damian Kindler	Martin Wood	August 19, 2005 (Sci Fi Channel)
After having found an experimental Ancient power generator, McKay becomes obsessed to triumph where the Ancients failed, but the price might be too high. Elsewhere, Teyla and Ronon go to the planet Balkan to trade, but discover that not all of Ronon's people died.
27	207	"Instinct (Part 1)"	Treena Hancock and Melissa R. Byer	Andy Mikita	August 26, 2005 (Sci Fi Channel)
While investigating a planet, the team comes across a Wraith girl who has been raised by her human "father," hiding from the people of the nearby village in fear of her life. But she doesn't consider the consequences when she takes an incomplete drug to turn herself human.
28	208	"Conversion (Part 2)"	Robert C. Cooper and Martin Gero	Brad Turner	September 9, 2005 (Sci Fi Channel)
After Ellia injects him with the retro-virus (Instinct), the Atlantis team races against time to find a way to reverse Sheppard's transformation into an Iratus bug hybrid. But even though Sheppard might make it difficult for them, he could be the key to his own salvation.
29	209	"Aurora"	Carl Binder and Brad Wright	Martin Wood	September 23, 2005 (Sci Fi Channel)
The team finds an Ancient warship still inhabited Ancients in suspended animation. They are all connected together through a virtual environment, that Sheppard enters to communicate with them. The only problem being, the Ancients think that their virtual lives are reality.
30	210	"The Lost Boys (Part 1)"	Martin Gero	Brad Turner	September 23, 2005 (Sci Fi Channel)
Sheppard's team is kidnapped off-world, only to find that their captor is none other than Ford. He has recruited several men into taking the Wraith enzyme, and now they intend to use the team to destroy a Hive Ship to prove the "glorious" effects of the drug.
31	211	"The Hive (Part 2)"	Carl Binder	Martin Wood	November 21, 2005 (The Movie Network)
After the attempt to destroy the Hive backfires, the team becomes captured by the Wraith, demanding answers. Meanwhile, Dr. McKay takes a massive dose of enzyme and escapes to Atlantis in a state of frenzy, but his choice could put him on the edge of death. (This episode was nominated for a Gemini Award in the category "Best Sound in a Dramatic Series".)
32	212	"Epiphany"	Joe Flanigan and Brad Wright	Neil Fearnley	November 28, 2005 (The Movie Network)
Sheppard gets pulled into an Ancient device, separating him from the rest of his team and the outside world. While trying to get him out, the team discovers that time moves much more quickly inside and Sheppard could die of old age before they release him.
33	213	"Critical Mass"	Carl Binder	Andy Mikita	December 5, 2005 (The Movie Network)
It is discovered that The Trust have infiltrated Atlantis and planted a bomb inside, set to go off the next time they dial Earth. To add to the tension, two Wraith cruisers are on the way, and Dr. Weir wants to figure out if there could be a Goa'uld spy in Atlantis' midst.
34	214	"Grace Under Pressure"	Martin Gero	Martin Wood	December 12, 2005 (The Movie Network)
During the test run of a recently repaired puddle jumper, it crashes deep into the ocean, leaving Dr. McKay sinking underwater. When he shows the first signs of losing hope (and sanity), he must rely on a hallucination of Lt. Col. Samantha Carter for his survival. (For this episode, Joel Goldsmith was nominated for an Emmy in the category "Outstanding Music Composition for a Series (Original Dramatic Score)".)
35	215	"The Tower"	Joseph Mallozzi & Paul Mullie	Andy Mikita	December 19, 2005 (The Movie Network)
The team finds a world that possesses Ancient technology, but only the royal family may be allowed to operate it and lowly villagers are treated with little dignity. When he tries to set things right, Sheppard finds himself a pawn in the rivalry between the heirs to the throne.
36	216	"The Long Goodbye"	Damian Kindler	Andy Mikita	January 2, 2006 (The Movie Network)
After recovering two alien stasis pods from space, the minds of the inhabitants are transferred into Dr. Weir and Sheppard. But when it's discovered that the two are enemies hoping to settle an ancient score, the alien combatants put the entire population of Atlantis in danger.
37	217	"Coup D'etat"	Martin Gero	Martin Wood	January 9, 2006 (The Movie Network)
Ladon Radim comes to the expedition wanting to overthrow the Genii leader, Cowen. They are reluctant to help, but it seems he has discovered a ZPM that he could trade with the expedition. Later, Radim's true motives are revealed... for the time being.
38	218	"Michael"	Carl Binder	Martin Wood	January 16, 2006 (The Movie Network)
An amnesiac young Lieutenant in Atlantis, Michael Kenmore, suffers poor treatment from the personnel, and disturbing nightmares that he is a Wraith. Yet things become worse, when he accidentally stumbles upon a shocking discovery about himself... he is one.
39	219	"Inferno"	Carl Binder	Peter DeLuise	January 23, 2006 (The Movie Network)
The team comes to aid a civilization taking refuge throughout an Ancient outpost. While trying to repair systems, McKay discovers a volcano below the outpost that will obliterate the entire planet, suggesting evacuation. Yet during the process, the Stargate is destroyed.
40	220	"Allies (Part 1)"	Martin Gero	Andy Mikita	January 30, 2006 (The Movie Network)
A Wraith faction (including Michael) contacts Atlantis to seek help in destroying their common enemies, the Wraith. Because the Wraith are currently engaged in a destructive civil war, they suggest using Atlantis' retro-virus to turn their native foes into human prey.

Season 3

This season concentrates on more character driven stories. Along with new insight on the characters, the expedition discovers a new threat, one that could be the pre-cursor to the Replicators. Some important characters leave the series in this season, and the fate of Atlantis once again is in the hands of the Tau'ri.

#	#	Title	Written by	Directed by	Original airdate
41	301	"No Man's Land (Part 2)"	Martin Gero	Martin Wood	July 14, 2006 (Sci Fi Channel)
After the Wraith betrayed the expedition (Allies), they head to Earth with McKay and Ronon. Meanwhile, Elizabeth must answer to the IOA due to her actions during the short-lived alliance, and Sheppard must stop the hive ships from reaching Earth, whatever the cost.
42	302	"Misbegotten (Part 3)"	Joseph Mallozzi & Paul Mullie	Martin Wood	July 21, 2006 (Sci Fi Channel)
After using the retro-virus to turn an entire hive into humans, they create a Stargate-less colony for them to live until a more permanent solution is found. All the while, Richard Woolsey arrives at Atlantis to observe Dr. Weir to see if she's fit to lead the expedition.
43	303	"Irresistible"	Carl Binder	Martin Wood	July 28, 2006 (Sci Fi Channel)
The Atlantis team encounters a village that adore one man to the point of insanity. He claims to have medicines to offer the team, but when Beckett investigates, he brings the man back to Atlantis smitten by the man's charm. Soon, the entire expedition falls under his spell.
44	304	"Sateda"	Robert C. Cooper	Robert C. Cooper	August 4, 2006 (Sci Fi Channel)
When Ronon becomes a prisoner offworld, his captors hand him over to the Wraith, who take him to his homeworld. There, he is forced to once again become their prey, but witness to his capture, Sheppard's team races to Sateda to return him to his new home.
45	305	"Progeny (Part 1)"	Carl Binder	Andy Mikita	August 11, 2006 (Sci Fi Channel)
Weir and the team visit an advanced civilization that split off from the Lanteans thousands of years ago, and have built an entire planet out of Ancient technology. But after their adverse behavior, they soon discover they might not even be Lantean or organic for that matter.
46	306	"The Real World (Part 2)"	Carl Binder	Paul Ziller	August 18, 2006 (Sci Fi Channel)
Dr. Weir awakens in a sanitarium outside of D.C. only to find that Atlantis, and the Stargate Program, was a fantasy. But after a series of nightmarish visions, she doesn't take long to realize things aren't what they appear to be, and she is determined to return to the city.
47	307	"Common Ground"	Ken Cuperus	William Waring	August 25, 2006 (Sci Fi Channel)
Sheppard is captured by Kolya, who plans to trade him for Ladon Radim. To help persuade Dr. Weir, he uses his captured Wraith to feed off Sheppard over and over again. To escape, Sheppard must find common ground with the only one who wants to achieve the same goal.
48	308	"McKay and Mrs. Miller"	Martin Gero and Carl Binder	Martin Wood	September 8, 2006 (Sci Fi Channel)
On Earth, a young housewife has written a ground-breaking proof that could benefit Atlantis. She is McKay's sister who has given up a career as a scientist to raise a family, and when he persuades her to come to Atlantis, another Rodney comes from an alternate reality. (For this episode, writer Martin Gero was nominated for a Gemini Award in the category "Best Writing in a Dramatic Series".)
49	309	"Phantoms"	Carl Binder	Martin Wood	September 15, 2006 (Sci Fi Channel)
Trying to locate a missing team, Sheppard's team finds a Wraith hallucinatory device, and after a few hours of research, McKay deems it to be a threat for everyone's saftey. Yet, while attempting to leave, the DHD explodes, leaving them to become victim to the device.
50	310	"The Return (Part 1)"	Martin Gero	Brad Turner	September 22, 2006 (Sci Fi Channel)
During the first test of the intergalactic bridge, the Daedalus discovers an Ancient Warship between the two galaxies. Rescuing the residents onboard, the team is shocked, when they learn that the Ancients want the expedition gone, forcing exodus back to Earth.
51	311	"The Return (Part 2)"	Martin Gero	Brad Turner	November 20, 2006 (The Movie Network)
When the Asurans take the city under Ancient command, O'Neill and Woolsey are captured in the crossfire, forcing the team to disobey orders and return to the Pegasus Galaxy. Reuniting with Teyla and Ronon, they must reclaim Atlantis without destroying it in the process.
52	312	"Echoes"	Carl Binder and Brad Wright	Will Waring	November 27, 2006 (The Movie Network)
Everyone starts to see ghosts of Lanteans, caused by echoes being emitted by whale-like creatures converging on the city. When side effects begin to occur, McKay discovers that the Ancients tried to teach the whales their language, who now might be trying to warn them.
53	313	"Irresponsible"	Joseph Mallozzi & Paul Mullie	Martin Wood	December 4, 2006 (The Movie Network)
Lucius Lavin (Irresistible), is up to his old tricks again, he's using an Ancient Personal Shield Emitter (Hide and Seek) to pose as an invincible hero, but needs the team's help when Acastus Kolya shows up to deal with Lavin personally.
54	314	"Tao of Rodney"	Damian Kindler	Martin Wood	December 11, 2006 (The Movie Network)
After an Ancient device within the city alters Rodney's DNA, he gains superhuman powers. Although he initially takes them as a blessing, his enhanced brilliance is checked only by his impending death... unless he learns to overcome his ego to ascend.
55	315	"The Game"	Don Whitehead, Holly Henderson, and Carl Binder	Will Waring	December 18, 2006 (The Movie Network)
Major Lorne's team discovers a planet that fits the description of Lt. Col. Sheppard and Dr. McKay's competitive video game. It turns out that it has been controlling real people through a series of Ancient satellites, who now stand on the brink of war and destruction.
56	316	"The Ark"	Scott Nimerfro and Ken Cuperus	William Waring	January 8, 2007 (The Movie Network)
Colonel Sheppard's team discovers a space station where the last of a race of humans remain. They soon discover, however, the entire population is in danger when the station is damaged through the suicide of a recently awoken resident.
57	317	"Sunday"	Martin Gero	Will Waring	January 15, 2007 (The Movie Network)
The expedition tries to relax during a mandatory day off, until an unexpected explosion leaves three people dead, and reveals that one other scientist is a walking time bomb. Unfortunately, the attempt to resolve the issue will result in the loss of an important face in Atlantis.
58	318	"Submersion"	Ken Cuperus	Brenton Spencer	January 22, 2007 (The Movie Network)
The team discovers a drill platform at the bottom of the ocean which may be an alternative to ZPMs, but during their visit, they are ambushed by an old Wraith Queen. Once they capture her, Teyla's desire to get information could lead her down a dangerous path.
59	319	"Vengeance"	Carl Binder	Andy Mikita	January 29, 2007 (The Movie Network)
Now that the Wraith see Michael as an "unclean thing," he has been experimenting with Iratus bugs, creating monsters for an army to rule the galaxy. When the team stumbles on one of his labs, they are in for a world of hurt when they are attacked by countless creatures.
60	320	"First Strike (Part 1)"	Martin Gero	Martin Wood	February 5, 2007 (The Movie Network)
When the Apollo arrives, they launch a preemptive strike against the Asurans when it is discovered that they are building a fleet of ships. When the armada is destroyed, a weapons satellite appears above the city, and unless they can fly away, Atlantis will be no more.

Season 4

Template:Future television Amanda Tapping (Col. Samantha Carter) joins the cast as a regular for 14 episodes, Jewel Staite (Dr. Jennifer Keller) will be a recurring character for eight episodes, while regular cast member Torri Higginson (Dr. Weir) will become a recurring cast member for four episodes. The season started September 28th, 2007, airing on the SCI FI channel in the United States. In the United Kingdom, the season premiered on Tuesday, October 9th, 2007 on Sky One.

#	#	Title	Written by	Directed by	Original airdate
61	401	"Adrift (Part 2)"	Martin Gero	Martin Wood	September 28, 2007 (Sci Fi Channel)
After escaping the Asuran satellite weapon, Atlantis encounters further problems as their shield begins to severely deplete their taxed ZPM. With little resources, the team undertakes a myriad of repairs, while Dr. McKay and Dr. Keller are forced to make a tough decision.
62	402	"Lifeline (Part 3)"	Carl Binder	Martin Wood	October 5, 2007 (Sci Fi Channel)
Colonel Sheppard's team and Dr. Weir must plan a daring infiltration of the Asuran homeworld, to steal a ZPM from the Replicators, power up Atlantis, and head to their new home. Meanwhile, Colonel Samantha Carter and the Apollo try and search for the lost city.
63	403	"Reunion"	Joseph Mallozzi and Paul Mullie	Will Waring	October 12, 2007 (Sci Fi Channel)
When Ronon finds his old companions, they tell how they survived when Sateda fell. Carter, new head of Atlantis, is reluctant to bring them to Atlantis, causing Ronon to decide whether to stay or live with his former allies, who harbor dark secrets on how they really survived.
64	404	"Doppelganger"	Robert C. Cooper	Robert C. Cooper	October 19, 2007 (Sci Fi Channel)
After coming across a crystalline species similar to one that Jack O'Neill encountered ten years ago, Sheppard inadvertently carries it back to Atlantis after contact with it. As it moves into other members, it's bent on destroying them in nightmares in the form of Sheppard.
65	405	"Travelers"	Joseph Mallozzi and Paul Mullie	Will Waring	October 26, 2007 (Sci Fi Channel)
Sheppard is captured by a race of humans that have lived for generations in space to avoid any Wraith contact, and have heard of rumors about a powerful enemy against the Wraith, the Atlantis Expedition. Now they intend to use Sheppard to activate an Ancient Warship.
66	406	"Tabula Rasa"	Alan McCullough	Martin Wood	November 2, 2007 (Sci Fi Channel)
A deadly disease courses through Atlantis, causing the entire expedition to lose their memories. The only catch is that Teyla and Ronon haven't, and they must convince everyone to work together and find a cure, before their memories are gone forever.
67	407	"Missing"	Carl Binder	Andy Mikita	November 9, 2007 (Sci Fi Channel)
While on an offworld trip to New Athos, Teyla and Dr. Jennifer Keller find that the Athosian settlement has been abandoned, in the wake of the arrival of primitive warriors, who don't want them to get off of the planet alive, which raises a larger question, where are the Athosians?
68	408	"The Seer"	Alan McCullough	Andy Mikita	November 16, 2007 (Sci Fi Channel)
Searching for the Athosians, the team finds Davos, a man who can see into the future, and he brings grave news about the destruction of Atlantis. Meanwhile, the Wraith captured by Kolya nearly a year ago, proposes an alliance, to shut down the Replicator attack code.
69	409	"Miller's Crossing"	Martin Gero	Andy Mikita	November 30, 2007 (Sci Fi Channel)
Jeannie Miller is kidnapped by Henry Wallace on Earth, after Wallace determines that only she and her brother can save his child’s life using nanotechnology. McKay comes to the rescue, but inadvertently gets captured too, and the two must prevent Wallace's daughter's death.
70	410	"This Mortal Coil (Part 1)"	Joseph Mallozzi and Paul Mullie	Will Waring	December 7, 2007 (Sci Fi Channel)
After a mysterious Ancient drone collides into Atlantis, the team must wonder if the Replicators may have found the city... and if Davos' prediction about the destruction of the lost city will come true. Yet, things become even stranger, when Elizabeth Weir reappears.
71	411	"Be All My Sins Remember'd (Part 2)"	Martin Gero	Andy Mikita	January 4, 2008 (Sci Fi Channel)
The team hopes to eliminate the Replicators once and for all, by recruiting a fleet of Hives to fight alongside the Daedalus and the Apollo. Unfortunately, not many ships flock to the cause, and the expedition might cause a chain of events that they won't be able to contain.
72	412	"Spoils of War (Part 3)"	Alan McCullough	Will Waring	January 11, 2008 (Sci Fi Channel)
The Atlantis team successfully salvages a partially damaged Hive ship from their previous actions concerning their fight against the Replicators, and in the process, retrieve some critical information that may help in their never-ending battle against the Wraith.
73	413	"Quarantine"	Carl Binder	Andy Mikita	January 18, 2008 (Sci Fi Channel)
An imposed lockdown of Atlantis traps several personnel in various parts of the city with people that they never expected, threatening to challenge various relationships that are spread throughout the entire expedition... and allowing others to bloom, which nearly involves a kiss between Dr Keller and Ronan.
74	414	"Harmony"	Martin Gero	William Waring	January 25, 2008 (Sci Fi Channel)
Offworld on a familiar planet, Sheppard and McKay agree to escort a princess, Harmony, to some ruins where she can assume the title of queen. On their simple and routine mission, they find that a Genii contingent is hunting Harmony down, by orders of her own sister.
75	415	"Outcast"	Carl Binder	Andy Mikita	February 1, 2008 (Sci Fi Channel)
When Sheppard's father dies, he and Ronon return to earth to mourn his loss, but also discover that there has been an outbreak: A human-form replicator on the loose. Upon further investigation, they discover that it was actually created illegally by scientists on Earth.
76	416	"Trio"	Martin Gero	Martin Wood	February 8, 2008 (Sci Fi Channel)
While offworld, Dr. McKay, Dr. Keller, and Col. Carter become locked in an underground cavern, with no apparent means for escape. To wile away the long hours, the three try to make the best of it, and attempt to get to know each other a little bit better.
77	417	"Midway"	Carl Binder	Andy Mikita	February 15, 2008 (Sci Fi Channel)
As a request from Col. Carter, Teal'c makes a journey to Atlantis to help out Ronon, when he comes up for review by the I.O.A. After tensions rise between the two warriors, they learn disturbing news... a group of Wraith have made it to the Midway station, and Earth.
78	418	"The Kindred (Part 1)"	Joseph Mallozzi and Paul Mullie	Peter F. Woeste	February 22, 2008 (Sci Fi Channel)
As a mysterious new illness spreads throughout the Pegasus Galaxy, Teyla is convinced that the father of her child is trying to communicate with her through telepathic visions about what this plague is... but it turns out to be another face that Atlantis is familiar with.
79	419	"The Kindred (Part 2)"	Joseph Mallozzi and Paul Mullie	Peter F. Woeste	February 29, 2008 (Sci Fi Channel)
The team is stunned when Carson Beckett ends up in Michael's clutches. In order for him to return to Atlantis, the team must perform a daring rescue mission that could play right into Michael's plans. Teyla discovers important information about her people.
80	420	"The Last Man (Part 1)"	Joseph Mallozzi & Paul Mullie	Martin Wood	March 7, 2008 (Sci Fi Channel)
When Sheppard returns from a routine mission, he finds that Atlantis has been abandoned by everyone, and the city is surrounded by nothing but sand dunes for miles. Now, as the last man in the city, he must uncover the reason for this strange turn of events.

Season 5

#	#	Title	Written by	Directed by	Original airdate
81	501	"Search and Rescue (Part 2)"	Martin Gero	Andy Mikita	To be announced
Carter launches a rescue operation for several victims of a huge off-world explosion, but the rescue party must also combat Michael and his army who also wish to recover the survivors. Captain Alicia Vega joins the expedition.
82	502	"The Seed"	To be announced	To be announced	To be announced
No plot details have been revealed.
83	503	"Broken Ties"	Joseph Mallozzi & Paul Mullie	To be announced	To be announced
No plot details have been revealed.
84	504	"Whispers"	Joseph Mallozzi & Paul Mullie	To be announced	To be announced
No plot details have been revealed.
85	505	"Ghost In the Machine"	Carl Binder	To be announced	To be announced
No plot details have been revealed.
86	506	"The Daedalus Variations"	Alan McCullough	To be announced	To be announced
No plot details have been revealed.

See also

• List of Stargate SG-1 episodes
• Timeline of Stargate