Stargate Atlantis

The story of Stargate Atlantis follows the events of Stargate SG-1's seventh season finale episode "Lost City" and eighth season premiere episode "New Order", in which the cast of that series discovered an Antarctic outpost created by the alien race known as the Ancients. In the pilot episode "Rising", Stargate Command sends an international team to investigate the outpost, where Dr. Daniel Jackson discovers the location of Atlantis, the legendary city created by the Ancients, and Colonel Jack O'Neill visits the outpost after having been put in stasis and retrieved from it.
Source: 
TV