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Stargate Atlantis follows the present-day adventures of John Sheppard and his military team from Earth that, along with two dozen other teams, venture to distant planets. They use an alien device known as a Stargate, which is housed in the city of Atlantis on the planet "Lantea". The city was built millions of years ago by one of the most advanced races of the Stargate universe: the Ancients. Five to ten million years ago, due to a plague in the Milky Way Galaxy, they were forced to flee to the Pegasus Galaxy, and there they seeded life on hundreds of worlds as they had done in the Milky Way. |