With the arrival of the Apollo to Atlantis comes intel that the Replicators appear to be building a large armada to directly attack earth. Planning to strike first, Col. Ellis with the aid of the Atlantis team launches a surgical strike nuking the entire armada. Believing that all imminent danger has been avoided the team is shocked when a satellite housing a stargate takes up geosynchronous orbit above Atlantis. Unable to destroy the Stargate, it opens transmitting a powerful energy beam impacting Atlantis' shields. Being powered from the point of origin, neither the beam nor the satellite's shields show any vulnerability to the Apollo or Atlantis. Without any way of avoiding the beam as it quickly drains the ZPM powering the shields, Rodney McKay opts to sink the city as the ancients did millennia ago using the water to dissipate the beams strength. But when the sinking of the city doesn't have the desired effects, it appears it's only a matter of time before the shields fail. With the stargate active in

The Stargate SG-1 team discovers what they believe to be the remnants of the lost city of the Ancients the originators of the Stargates and Stargate Command launches an investigation to find the mythical city of Atlantis. Situated in the distant Pegasus Galaxy, it s farther than any Stargate team has ever traveled. With only enough power to make a one-way trip, a new team, headed by civilian Dr. Elizabeth Weir (Torri Higginson), is formed and travels through the gate to this unknown galaxy. There, they discover the marvels of the lost city of Atlantis . and encounter a sinister new enemy.

Waking up in a psychiatric hospital outside of Washington D.C., Dr. Elizabeth Weir (Torri Higginson) is shocked to discover that her entire experience in Atlantis over the last two years was solely a figment of her imagination. Through the help of her psychiatrist Dr. Fletcher (Alan Ruck), she learns that a car accident that killed her fianc left her in a near catatonic state and suffering from delusional psychosis. Forced to come to terms with this new reality Weir is visited by her mother and General Jack O'Neill (Richard Dean Anderson), who assures her that he has never heard of a Stargate program let alone the lost city of Atlantis. Yet as she starts to pick up the pieces of her life she continues to have unsettling visions warning her that she must return to Atlantis. Back on Atlantis the team holds vigil for the comatose Weir, who in reality has been infected by replicator nanites that are quickly taking over her body and mind. Even with the medical expertise of Dr. Carson Beckett (Paul McGillion) and

While testing the new McKay-Carter intergalactic gate bridge, the Daedalus detects an Ancient Atlantian warship, traveling at just below light speed and heading towards Earth. Damaged in battle during the war with the Wraith, the Ancients aboard this ship fled the Pegasus galaxy and have spent thousands of years in stasis. Back on Atlantis, the now awoken Ancients meet with General O'Neill (Richard Dean Anderson) and Richard Woolsey (Robert Picardo). They thank the Stargate team for taking care of the city in their absence, but ask them to vacate Atlantis immediately. While Ronon and Teyla stay in the Pegasus galaxy, the remaining team members struggle to resume their lives on Earth. Sheppard (Joe Flannigan) doesn't gel with his new SG team, McKay (David Hewlett) is bored in his Area 51 lab, and Weir (Torri Higginson) has trouble finding meaning in a life after Atlantis. However, the SGC soon learns that the Replicators have overtaken Atlantis, as McKay had previously enabled the Replicators to re-write

The hive ship approaching Atlantis is Michael's. He wants a trade: the retrovirus for not revealing the secret of Atlantis and insights on Wraith technology.

Zach stops by the 'Stargate Atlantis' booth for a shave and a haircut.

The discovery of an ancient secret leads to a shocking revelation that may forever alter the course of history in this imaginative entry from the folks who brought you Stargate SG-1. When the SG-1 crew unearths the remnants of what they believe to be the Lost City of the Ancients -- the very civilization that originated the Stargates -- an investigation by Stargate Command leads a new team of explorers to a distant galaxy. Headed by Dr. Elizabeth Weir, the explorers soon discover the deserted remnants of a highly advanced civilization settled on the ocean floor. When the daring explorers make contact with a group of nomadic humans, the discovery of an otherworldly enemy that feeds on fear offers a grim foreshadowing of things to come for the human race if they don't band together and fight the dark force that threatens to consume them all. ~ Jason Buchanan, All Movie Guide.

Jewel Staite (Dr. Jennifer Keller) answers fan questions from the Forum in this special Q&A series.

Joe Flanigan (Lt. Col. John Sheppard) answers fan questions from the Forum in this special Q&A series.

David Hewlett (Dr. Rodney McKay) answers fan questions from the Forum in this special Q&A series.