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CastEdit

EpisodesEdit

Main charactersEdit

Recurring charactersEdit

The third season of Stargate: Atlantis was a time of change for the series. The cast experienced several changes in the later part of the season, and the individual episodes focused more in this season on character development.

Joe Flanigan as Lt. Colonel John Sheppard (20/20 episodes)
Torri Higginson as Dr. Elizabeth Weir (20/20 episodes)
Rachel Luttrell as Teyla Emmagan (20/20 episodes)
Jason Momoa as Ronon Dex (20/20 episodes)
With Paul McGillion as Dr. Carson Beckett (14/20 episodes)
And David Hewlett as Dr. Rodney McKay (20/20 episodes)

David Nykl as Dr. Radek Zelenka (12/20 episodes)
Chuck Campbell as Chuck (12/20 episodes)
Mitch Pileggi as Colonel Steven Caldwell (6/20 episodes)
Kavan Smith as Major Evan Lorne (6/20 episodes)
Robert Picardo as Richard Woolsey (4/20 episodes)
Gary Jones as CMSgt. Walter Harriman (4/20 episodes)
Kirby Morrow as Captain Dave Kleinman (4/20 episodes)
Beau Bridges as Major General Henry Landry (3/20 episodes)
Bill Dow as Dr. Bill Lee (3/20 episodes)
Connor Trinneer as Michael Kenmore (3/20 episodes)
Trevor Devall as the voice of Hermiod (3/20 episodes)
Richard Dean Anderson as Major General Jack O'Neill (3/20 episodes)
John O'Callaghan as Niam (3/20 episodes)
Donna Soares as Dr. Coleman (3/20 episodes)
Robert Davi as Commander Acastus Kolya (2/20 episodes)
Ryan Robbins as Ladon Radim (2/20 episodes)
Richard Kind as Lucius Lavin (2/20 episodes)
Brahm Taylor as Lathan (2/20 episodes)
Panou as Cetus (2/20 episodes)
David MacInnis as Talus (2/20 episodes)
David Ogden Stiers as Oberoth (2/20 episodes)
Heather Doerksen as Major Pat Meyers (2/20 episodes)

Atlantis Season 3

Season 2

Season 4

Title	Number	Airdate	Planet(s)	Race(s)	Enemies
"No Man's Land (Part 2 of 3)"	301	July 14, 2006	Earth, Lantea	Asgard, Wraith	Wraith Queen
Two Wraith Hive Ships used the alliance to upgrade their hyperdrives to reach Earth. While the Daedalus and the Orion are sent to dispatch them, Dr. Rodney McKay and Ronon Dex escape from their cocoons, and Lt. Colonel John Sheppard uses his F-302 fighter-interceptor to attach himself on one of the ships to ambush them.
"Misbegotten (Part 3 of 3)"	302	July 21, 2006	Earth, Lantea, M8G-352	Asgard, Human-form Wraith, Wraith	Michael Kenmore
The Atlantis expedition stopped the Wraith from reaching Earth, and now that they turned Human, they send them to an isolated world to teach them to administer the Iratus bug retrovirus themselves. However, some of them, including Michael Kenmore, are starting to remember their past.
"Irresistible"	303	July 28, 2006	Lantea, Lucius' planet, M6H-491	Lucius' people, Wraith	N/A
The Atlantis expedition encounter Lucius Lavin, a highly obnoxious man, but everyone in his village seems to love him. After visiting Atlantis, Dr. Rodney McKay and Lt. Colonel John Sheppard notice that everyone in the city is starting to fall for him, and it is up to them to figure out why.
"Sateda"	304	August 4, 2006	Keturah's planet, Lantea, Sateda	Keturah's people, Wraith	Wraith Leader
Ronon Dex is noticed by the villagers he once visited during his time as a runner. After getting turned in by the villagers to the Wraith, he is implanted with another Wraith tracker and dropped off on his abandoned homeworld, Sateda, where he is forced to become a runner again.
"Progeny (Part 1 of 2)"	305	August 11, 2006	Asuras	Asuran	Oberoth
The Atlantis expedition makes first contact with the Asurans, who claim that they are the last of the Ancients. However, after holding the team prisoner, they learn that they are not people, but machines; Replicators, and they plan to destroy Atlantis.
"The Real World (Part 2 of 2)"	306	August 18, 2006	Lantea	Asuran	N/A
Dr. Elizabeth Weir awakens in a psychiatric hospital outside Washington D.C. where she is told that she never left Earth, and the entire Stargate Program, and Atlantis never existed.
"Common Ground"	307	August 25, 2006	Kolya's planet, Lantea, Unnamed	Genii, Wraith	Acastus Kolya
Lt. Colonel John Sheppard is captured by Commander Acastus Kolya, who wants the expedition to hand over Ladon Radim, in exchange of returning Sheppard. Sheppard is also imprisoned with a Wraith feeding on him, and the two form an unlikely alliance to escape the base.
"McKay and Mrs. Miller"	308	September 8, 2006	Earth, Lantea	Asgard	N/A
Jeannie Miller, Dr. Rodney McKay's sister has thought up a theory to bridge two realities together. Stargate Command, and McKay convince her to come to Atlantis to reform Project Arcturus. However, soon, another McKay appears in front of everyone's eyes.
"Phantoms"	309	September 15, 2006	Lantea, M1B-129	Genii, Wraith	N/A
The Lt. Colonel John Sheppard's team travel to M1B-129 to retrieve a missing team, but come across a Wraith Mind manipulator, making the team see things things that aren't there.
"The Return (Part 1 of 2)"	310	September 22, 2006	Earth, Lantea, New Athos	Ancient, Asuran, Genii	Cetus, Talus
While testing the McKay/Carter Intergalactic Gate Bridge, the Daedalus picks up an Ancient warship, the Tria, who retake control of Atlantis, and the expedition is expelled to Earth. However, the Asurans are heading straight for Atlantis.
"The Return (Part 2 of 2)"	311	November 20, 2006	Earth, Lantea, New Athos	Asuran	Cetus, Talus
The Lt. Colonel John Sheppard's team reunites to take out the Asurans, who have taken control of Atlantis, and plan to use Niam, who is drifting in space over Lantea. Meanwhile, Major General Jack O'Neill and Richard Woolsey do their best to avoid capture.
"Echoes"	312	November 27, 2006	Lantea	Ancient, Flagisallus	N/A
Teyla Emmagan starts seeing "ghosts" of Ancients wandering Atlantis, and soon other people start seeing them also. The visit from a group of Flagisallus are related, when they use the "ghosts" to warn the expedition of a Coronal mass ejection.
"Irresponsible"	313	December 4, 2006	Lantea, M65-PL8	People of M65-PL8, Genii	Acastus Kolya
Lt. Colonel John Sheppard's team travels to a planet to meet a "hero", only to find Lucius Lavin, who play-fights off Genii mercenaries to win the hearts of the villagers. However, the mercenaries soon contact Commander Acastus Kolya in order to capture Sheppard's team.
"Tao of Rodney"	314	December 11, 2006	Lantea	N/A	N/A
Dr. Rodney McKay gets "zapped" by a device, where his brain quickly evolves to that of the Ancients to achieve Ascension, and he gains super powers. However, he must learn to ascend, or he will die, but it isn't going to be easy.
"The Game"	315	December 18, 2006	Lantea, M4D-058	Geldaran, Hallonan	N/A
Major Evan Lorne reports back from M4D-058 and tells them they encountered a race of humans who has Dr. Rodney McKay's face on their flag. They learn that a game McKay and Lt. Colonel John Sheppard were playing is actually happening in reality. However, this also causes friction between McKay and Sheppard's worlds, who are on the brink of war.
"The Ark"	316	January 8, 2007	Jamus' homeworld, Lantea	Jamus' people	Jamus
Lt. Colonel John Sheppard's team discovers a Moon Base 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.
"Sunday"	317	January 15, 2007	Lantea	N/A	N/A
While the Atlantis expedition tries and relax on a regular Sunday, a mysterious explosion rocks the city, leaving three people dead. It is later revealed that a scientist is a walking time-bomb, and has to be stopped. However, the attempt to resolve the problem will result in the loss of an important figure in Atlantis.
"Submersion"	318	January 22, 2007	Lantea	Wraith	Wraith Queen
The Atlantis expedition explore a Mobile drilling platform under the ocean of Lantea. However, due to Teyla Emmagan's background, a Wraith Queen awakens after being stuck in a nearby crashed cruiser for 10,000 years.
"Vengeance"	319	January 29, 2007	Lantea, Taranian settlement	Bug People	Michael Kenmore
The Taranians have failed to contact Atlantis, so Lt. Colonel John Sheppard's team is sent to investigate. They find the settlement abandoned, and soon find them all dead, by Michael Kenmore's experimenting.
"First Strike (Part 1 of 3)"	320	February 5, 2007	Asuras, Lantea	Asuran	Oberoth
The new Earth battle-cruiser Apollo arrives in Atlantis to launch a preemptive strike against an armada of Asuran ships preparing to take off to Earth. However, after the strike is finished, a weapons satellite appears above the city and attacks its shields. If they cannot find away out of the situation, Atlantis will be no more.