Built thousands of years ago by the mysterious Ancients, and linked to countless planets through a network of stargates, Atlantis is a treasure trove of strange technology, all of it wondrous and some of it downright lethal. During their adventures, the Atlantis Expedition encounters great challenges, great friends, and great foes.
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Played by:
 | Joe Flanigan After graduation, Joe Flanigan pursued a writing career. He worked on Capitol Hill and then briefly for ... | |
Character Bio

John Sheppard (seasons 1–5 main): a United States Air Force Major recruited to the Atlantis Expedition due to his intuitive mastery over Ancient technology. He becomes the de facto commander of Atlantis' military contingent after the original mission commander Colonel Marshall Sumner is killed. His position is made official in season 2 after Atlantis re-establishes contact with Earth, and he is promoted to Lieutenant Colonel.
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