Atlantis expedition

The Atlantis Expedition is an expedition composed of the Tau'ri who travelled to Atlantis, as well as several different natives of the Pegasus Galaxy.

Staff
 Base of Operations:  Lost City of Atlantis

Senior Members

 * Richard Woolsey - Expedition Leader (Season 5)
 * Lt. Col. John Sheppard - Military Commander
 * Dr. Rodney McKay - Chief Technical Advisor
 * Teyla Emmagan - Pegasus Liasion
 * Dr. Jennifer Keller - Chief Medical Officer (Season 4-)
 * Col. Steven Caldwell - Commander of the Daedalus (Season 2-)
 * Ronon Dex - Special Operations Advisor (Season 2-)
 * Col. Abraham Ellis - Commander of the Apollo (Season 3-)

Known Members

 * Maj. Evan Lorne - Exploration Team leader
 * Dr. Radek Zelenka - Scientist/Engineer
 * Dr. Coleman - Scientist
 * Sgt. Stackhouse - Reconnaissance Team leader
 * Sgt. Bates - Security Chief. Critically wounded in Wraith attack, now works for IOA.

Former members

 * Dr. Elizabeth Weir - Expedition Leader (Seasons 1-3). Captured by the Asurans; status unknown.
 * Col. Samantha Carter - Expedition Leader (Season 4)
 * Dr. Carson Beckett - Chief Medicial Officer (Seasons 1-3). Killed in freak accident; cloned by Michael, in stasis at Atlantis.
 * Col. Marshall Sumner - Military Commander. Captured by Wraith; KIA.
 * Col. Dillon Everett - Planetary Defence Commander. Critically wounded in Wraith attack, returned to Earth.
 * Maj. Leonard - Exploration Team Leader. Committed suicide while under influence of psychosis-inducing Wraith device.
 * Lt. Aiden Ford - Second in Command to Major Sheppard. Became addicted to Wraith enzyme, went AWOL; status unknown, presumed dead.
 * Dr. Peter Grodin - Engineer/Administrator. Killed in Wraith attack.
 * Lindstrom - Scientist/Engineer. Killed by computer virus aboard the Daedalus prior to reaching Atlantis.
 * Walker and Stevens - Soldiers, deceased

Races Encountered

 * Athosians: A pre-industrial civilization, the Athosians were the first Pegasus natives the Atlantis expedition encountered. After their planet was culled by the Wraith, they moved to Atlantis.
 * Genii: An advanced, militaristic culture with a technology level similar to mid-20th century Earth, that hide under the mask of simple, Amish-like farmers.
 * Alterans (Ancients): A historical, technically highly advanced race that once existed on Earth and other planets through out the Milky Way galaxy and are the builders of the Stargates. The Ancients moved from Earth to the planet in the Pegasus galaxy, taking their spacefaring city Atlantus with them, in order to spread new life.
 * Wraith: This hive-based species drove the Ancients out of the Pegasus galaxy around 8000 BC. They maintain thousands of worlds populated by humans as a source of food, and they feed off the life force of other beings.
 * Satedans: The Satedans had an industrialized technological civilization with large cities and energy weapons. They met the fate of all advanced civilizations in the Pegasus Galaxy when they were attacked and apparently destroyed seven years ago by the Wraith.
 * Hoffans: A race of humans that have a technological level similar to middle 20th century Earth.
 * Proculus: A pacific, pre-technological, Wraith-free human civilization thanks to the protection of their goddess, Athar, who turns out to be the Ancient Chaya Sar, punished by the Others to be able to help only her people.
 * Daganian: The people from the planet Dagan, an old Atlantis outpost. A ZPM, which they call Pontentia, was entrusted to them 10.000 years ago, but the order of monks that protected it was culled by the Wraith a long time ago. The Atlantis team helps them find the ZPM, but the Dagans take it away, since they can only give it back to the Ancients and the humans, even if they live in Atlantis, are not Ancients
 * Olesia: A technologically advanced civilization. They say they pride themselves on being hospitable and civilised people.
 * Ballkans: A Middle-Ages level human civilization the Athosians trade with. Some Satedan survivors went there after their city fell.