Stargate Atlantis follows the present-day adventures of
Major John Sheppard and his military team from Earth that along with two dozen other teams explore distant planets in the Pegasus Galaxy. They use an alien device known as a
Stargate that was built millions of years ago by an advanced race of people known as the
Ancients. The expedition is based in the Lost City of
Atlantis on the planet "Lantea". The city was abandoned 10,000 years ago by the
Ancients, who were forced to flee after losing a long war to a powerful enemy known as the
Wraith. They were forced to submerge their city beneath Lantea's ocean, which in the Stargate universe is the source of the
Greek myth of the Lost City of
Atlantis.
Stargate: Atlantis episodes feature a self-contained story that also contributes to the larger story line of the war against the Wraith and the Atlantis residents' search for the means to destroy their enemy. Each season has also featured a two-part episode, and some episodes feature direct continuity with the story of the previous episode. Each episode begins with a
cold open, sometimes preceded by a recap of events relevant to the upcoming narrative. The
opening credits feature an original theme by
Joel Goldsmith. Though they were cut at the start of season 2, the full credits were restored after the mid-season two-part episode.
Episodes Seasons 1–3 Season one began airing in the United States on July 16, 2004. The Atlantis expedition, led by
Dr. Elizabeth Weir, arrives at Atlantis, the city of the Ancients. The expedition quickly finds itself in a dire situation that forces them to seek new friends, the
Athosians, but they also acquire a powerful new enemy: the
Wraith. Due to the power requirements for reaching Lantea, they are unable to contact Earth. The expedition must survive in a new galaxy, while deciphering the Ancients' technology in order to find a way to destroy the Wraith and to acquire important new knowledge. Major Sheppard puts together a team consisting of himself, Dr. Rodney McKay, Lt. Ford and the Athosian leader
Teyla Emmagan, who serve as Atlantis' first contact team. In one of their first missions, they make another enemy, the
Genii, a human militaristic civilization with a 1950s level of technology. After several more revelations about the Wraith are made, the expedition prepares to evacuate. Just before they do, a military contingent from Earth arrives to help defend the city against the impending Wraith attack long enough for Earth's latest battleship to arrive. The season ends with a cliffhanger, while the city is still under siege by the Wraith. Season two began airing in the United States on July 15, 2005, and it picked up where Season 1 ended. The Atlantis expedition successfully avoids being culled by the Wraith by making them believe Atlantis had been destroyed, and they recover semi-regular contact with Earth, thanks to the starship Daedalus and power from a new Zero Point Module (ZPM) recovered by SG-1. Sheppard is promoted to Lt. Colonel and as Lt. Ford, who went
missing in action (MIA) at the end of the battle with the Wraith, is replaced by
Ronon Dex a human freed from the Wraith. The central plot of the second season is the development of Dr.
Beckett's retrovirus, which can, theoretically, turn a Wraith into a human. While an incomplete version makes a young Wraith girl lose all her humanity and almost turns Sheppard into an
Iratus bug, a more developed version is tested on a living Wraith, "
Michael", with mixed results. Michael's Wraith faction proposes an alliance with Atlantis, but they betray the team. The season closes again with a cliffhanger—the Wraith are heading for the rich feeding grounds of Earth. Season three premiered in the United States on July 14, 2006, picking up where season 2 ended. Having stopped the Wraith from reaching Earth and having failed to develop a working Wraith retrovirus, the expedition faces its third year in the Pegasus galaxy with the Wraith still a threat and a new, powerful enemy bent on destroying the expedition and Atlantis: the
Asurans, self-replicating nanobots, also known as Replicators. The situation becomes complicated when an experiment gone awry drains their only ZPM, leaving them without a power source for the city's shields. Soon thereafter, they find a lost Ancient vessel and unwillingly turn over the city of Atlantis to its crew. The SGC sends General O'Neill and Richard Woolsey to try to negotiate an agreement between Earth and the Ancients to allow the expedition to return to Atlantis. The Ancients are then subsequently killed by an invading Asuran force while O'Neill and Woolsey send off a distress call to Earth and go into hiding. The main members of the Atlantis expedition on Earth disobey their orders and go back to the city, rescue O'Neill and Woolsey, and repel the Asuran invasion. The season finale begins with Earth launching a first strike against the Asurans, who are building an armada to attack Earth. The Asurans counterattack by attacking Atlantis with a powerful beam weapon fired through a satellite housing a Stargate. As a last resort, the Atlantis team fires up the city's stardrive and escapes into space. The finale ends when the hyperdrive malfunctions, leaving the city flying through uncharted space with a day's worth of energy left in their sole ZPM and Dr. Weir critically injured.
Seasons 4–5 Season four premiered in the USA on September 28, 2007, and in the UK on October 9, 2007. The writers stated that season 4 would take the series in a new direction. As the 4th season begins where season 3 ended, the future seems bleak: Weir is incapacitated and the senior members of the expedition have suffered multiple injuries. With the city damaged, running out of power and drifting in space, cut off from Earth, the Atlantis expedition raids Asuras to obtain a ZPM and is able to travel to a nearby planet. Weir is captured by the Asurans and Colonel Samantha Carter joins as a regular and acts as the expedition leader. She appears in the episode "Lifeline" after helping to find and land Atlantis on its new home planet; she is then ordered back to the SGC. In episode 3, under the IOA's orders, Carter returns to Atlantis as the new leader of the expedition after Atlantis lands. The season focuses on the main antagonists: the Asurans and the Wraith, as well as the pregnancy of Teyla Emmagan. The Asuran base code is reprogrammed by McKay, leading the nanobots to fulfill the purpose for which the Ancients created them: to wipe out the Wraith. Midway through the season, they are seemingly destroyed, and the remaining episodes concentrate mainly on Michael's efforts against both humans and the other Wraith. In the fifth season,
Richard Woolsey replaces Carter as the leader of the expedition. Teyla, who was held captive by Michael, gives birth to Torren John and escapes with her team, before they are able to cripple Michael. Eventually, he invades Atlantis with a commandeered Puddle Jumper to take Torren and destroy Atlantis but, thanks to the efforts of Sheppard, Teyla, and McKay, Michael is finally killed. The season also introduces a group of rogue
Asgard, who unlike their
Ida counterparts, actually experiment on humans to prolong their lives, and steal a device known as "The Attero device" to destroy the Wraith, though the side effect is that any Stargate activated after the device has been turned on will explode. The device is eventually destroyed. With the Attero device, Michael and the Hoffan drug, the Wraith have become weakened, and are no longer the power of the galaxy they once were; this gives the humans of the Pegasus galaxy freedom enough to establish a coalition. McKay falls in love with
Keller, who eventually reciprocates his feelings, and they become romantically involved. In the
season finale (also the
series finale), "
Enemy at the Gate", Todd the Wraith alerts Atlantis to the fact that an underling wraith possesses a Hive Ship powered by a ZPM. In the process of trying to retrieve the ZPM and disable the Hive, the Daedalus is crippled, and the hive suddenly jumps away without destroying the Daedalus. The Atlantis team discovers the reason for this was a communication sent from an alternate reality giving away Earth's location. The Hive disables both the battleships Sun Tzu and the Apollo en route to Earth. With a full set of ZPMs turned over by Todd, the expedition takes Atlantis using an experimental Wormhole Drive, to defend Earth. The Hive ship is then destroyed in the subsequent battle and Atlantis lands in the Pacific Ocean near the Golden Gate Bridge in
San Francisco. ==Cast==