A hive ship turbo-charged with a ZPM has received the Wraith's message from a alternate universe containing the location of Earth. The ship is now heading for Earth.

The killings of a Wraith in Las Vegas are investigated by Detective John Sheppard - who knows nothing about life-sucking aliens from another galaxy.

An alien mind takes up residence in Jennifer's body and seems as confused as her colleagues are by her erratic behavior. Which begs the question; where is Jennifer?

A Wraith cruiser arrives at Atlantis and is strangely uncommunicative. The anti-wraith drug story arc is concluded and we see a relationship blossom.

Rodney finally invites Jennifer on a date; to attend a science conference with him. But petty jealousies arise at the conference that have to be suppressed when a proposed solution for global warming has potentially lethal side effects.

The Atlantis team endeavors to thwart Wraith plans to either find a cure for the Hoffan drug (which makes humans deadly to Wraith feeding on them) or exterminate all those infected.

Jennifer, Ronon & Rodney find themselves in the middle of a Wraith fox hunt when Jennifer is kidnapped by a runner (the fox) to help him with an humanitarian mission.

Sheppard and Beckett battle zombie-like, wraith-engineered mutants with a team of the best and brightest female SG members. They also happen to be gorgeous - the SG team, not the mutants.

Rodney is infected with a deadly illness known as "second childhood" which diminishes his mind capabilities and makes him lose his memory gradually.

A group of beings stranded in sub-space seek help from Atlantis to return to normal space. But their outrageous claims and erratic behavior strains the trust of their benefactors and forces a painful solution.

An empty Daedalus is found orbiting the planet. The team goes to check it out and they are transported to an alternate universe.

Ronon is abducted by a Wraith who tries to brainwash him.

Dr. Carson Beckett is removed from stasis because he's the only one who can find the antidote to a mysterious virus that has incapacitated base personnel, beginning with Dr. Jennifer Keller.

Keller, Carter and McKay are stranded in an abandoned Genii mine while off-world.

After returning to Earth for his father's funeral, John Sheppad discovers the existence of a human form replicator loose in the population.

Sheppard and McKay must escort a prospective queen as part of their diplomatic duties, unaware that an ambush has been set by some familiar enemies.

The entire city locks down for a false quarantine, leaving people stranded with a decreasing amount of oxygen, while Rodney is unable to reach a computer.

A transmission from space leads the team to the discovery of a breeding ground for Wraith soldiers.

The Atlantis team decides to attack the numerous ships of the Replicators, with the help of uneasy alliances.

When what appears to be a satellite crashes into Atlantis, the team becomes aware of strange behaviour on the base.

Teyla and Dr. Keller go to the Athosian's new planet, and what they see is that the Athosian are not there anymore. They've gone missing. It seems to be the work of a warrior tribe, the Bola Kai.

While exploring a new planet, Sheppard started to watch a strange crystal. He doesn't know why, but he had to touch it. Back on Atlantis, everybody but him started to have some bad nightmares.

While on a regular mission, Ronan runs into some Satedan friends from his past. As old emotions start to return, new thoughts come with them, one of which involves leaving Atlantis. But could danger be lurking just around the corner?

After learning the Asurians are building a fleet of ships, Earth sends its newest ship, the Apollo, under the command of Colonel Abe Ellis to initiate a preemptive first strike to stop them from attacking Atlantis or worse, Earth itself.

The Atlantis team finds an Ancient underwater research facility and puts a team together to check it out.

The team boards a crippled space station to discover people have been preserved there with the hope to outlive their enemy, the Wraith.

The Atlantis team finds a program in the Atlantis database which throws Mckay and Sheppard into a Simsesque game that could destroy two civilizations in the Pegasus Galaxy.

When Rodney uses an Ancient device, he gets special powers, but soon Dr Weir discovers it's a double-handled gift: if he doesn't ascend, he'll die.

The team investigate rumours of an invincible hero off-world, only to find Lucius Lavin again manipulating a hapless village.

Teyla witnesses what appear to be an Ancient apparitions, which soon other people start to see.

The team returns to Atlantis in an attempt to regain control of the city.

The Atlantis expedition must turn to an old friend for help as the Asurans prepare to invade the city.

A device that creates hallucinations affects the team off-world.

Rodney's sister is brought to Atlantis to make use of one of her theories.

John Sheppard is kidnapped by the Genii and is in the company of a Wraith.

Dr Weir finds herself on Earth where, to everyone else, the Atlantis Expedition was just her delusion.

The Atlantis expedition encounters a highly advanced race, the Asurans. Who they at first believe to be the ancients. However, this new race is just a new face of an old nemesis.

After a group of people captures and gives Ronon to the Wraith, he becomes a runner again, but this time he's left in his home planet, Sateda, where the Stargate has been disabled.

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.

Atlantis helps with repairing an Ancient shield generator on Taranis. They discover the Taranians are in possession of an Ancient warship.

Michael Kenmore, a new lieutenant, awakes in the infirmary and doesn't remember a thing. The crew is very concerned about his well-being, he seems different.

While Teyla and Ronon investigate the mysterious death of major Lorne, the Genii Ladon Radim contacts Atlantis. He wants to trade in a ZPM.

The team discovers two life pods with a dying woman and man in it. Upon opening Weir gets imprinted with the mind of the woman. She asks a special favor.

The Stargate Atlantis team finds a world where the leader lives in a tower who possesses the power to stop the Wraith attacks.

McKay and a pilot crash with a puddle jumper into the ocean on Atlantis. They start to sink.

The Trust, a Goa'uld terrorist organization, has planted a bomb in Atlantis.

The teams discovers a ridge that can only be entered through a door. Sheppard gets pulled in by a field. McKay discovers time goes very fast behind it.

Sheppard's interrogation is suddenly aborted. Teyla senses another hive ship has arrived. Meanwhile McKay tries to convince his guard to call in help.

The team is captured by Ford and are forced to take the Wraith enzyme. Ford has a plan.

McKay finds an Ancient warship adrift in space. Sheppard finds out they are carrying a communique that mentions a weakness in Wraith technology.

Sheppard is infected with the Wraith retrovirus and slowly turns into an Iratus bug. To provide a treatment stem cells must be retrieved from one of their eggs.

The team find a hidden Wraith girl, cared for by a man with a serum stilling her hunger. Beckett wants to perfect a retrovirus turning Wraith into Humans.

The team discover an Ancient project to create the ultimate power source. McKay thinks he can finish it. Ronon finds out he is not the only surviving Satedan.

The team discovers a planet where the stargate is kept on a prison island to keep the Wraith satisfied. Their magistrate is willing to trade a rare mineral.

After an attempt to retrieve McKay and soldier Laura Cadman from the memory banks of a Wraith dart, Cadman gets stuck in McKay's mind.

The team is searching for Ford on a planet. Teyla and Sheppard are taken hostage by a stranger, while Ford tries to convince McKay that he's normal.

McKay, Sheppard, Beckett and Weir are on the Daedalus. McKay finds a Wraith virus that is infecting ship systems and sending a signal to the Wraith.

The Daedalus arrives and the two hive ships are destroyed. Atlantis seems saved, then Zelenka detects 12 more ships. Ford seems changed after a fall in the water.

All hope seems lost, until Colonel Everett arrives suddenly from Earth. He is determined to defend the city until the arrival of a ZPM, brought by a new ship.

McKay and Zelenka come up with the idea to repair the Ancients' weapon satellite. Bates and Teyla get into a fight, he is found unconscious a while later.

Teyla is haunted by nightmares, leaving her agitated. After seeing a psychologist, an old Athosian woman tells her a secret about her ability to sense the Wraith.

McKay finds a way to send a message to Earth, leaving space for personal messages. Sheppard and Teyla are off to spy on the Wraith fleet approaching Atlantis.

The team is on Dagan, where they must find key stones to retrieve a ZPM. Zelenka finds out Atlantis has a deep space scanner.

It's Elizabeth's birthday and she gets a very special gift: a woman who has been in stasis in an Atlantis' laboratory for 10,000 years and is actually herself.

Sheppard invites a priestess, who claims to not know about a weapon protecting her planet from the Wraith, to Atlantis to discuss asylum for refugees.

A team of scientists, including McKay, Zelenka and Ford, are exposed to a deadly virus. Sheppard goes after one of the scientists trying to escape.

Major John Sheppard, Rodney McKay and two scientists explore a planet where a Wraith spaceship, which fell there 10,000 years ago, during the Atlantis-Wraith War, is still sending a SOS signal.

McKay and Weir start repairing the grounding station, while Sheppard tries to fight Kolya. The puddle jumper on the mainland enters the eye of the storm.

Two hurricanes are approaching Atlantis and an evacuation is necessary. The leader of the planet taking them in tells the Genii about the situation.

A strange energy generating fog allows travel back to Earth. But something's wrong.

Atlantis wants to trade food with the Genii, a simple civilization who turn out to be not so simple. They are planning a nuclear attack against the Wraith.

Atlantis offers help to the Hoffans, who are working on a cure against the Wraith.

Rodney investigates a ZPM from a planet whose inhabitants kill themselves when they turned 25 years old to prevent the Wraiths from finding them profitable.

There's suspicion of a Wraith collaborator and some of the team suspect the Athosians. Ford and Sheppard find land on Atlantis' planet.

Sheppard gets bitten by a wraith-like bug and is dying. While the puddle jumper returns it gets stuck in the Stargate. There's 38 minutes for a solution.

Rodney can't get rid of a device that makes him invincible, disabling him to drink or eat. Meanwhile power malfunctions and one of the Athosians mentions seeing a shadow.

A team of scientists think they have found the location of the long lost city of Atlantis. It can be reached by a stargate that leads to another galaxy.