Within the ruins of the legendary city of Atlantis is buried a secret base left by the Ancients, originators of the Stargate. A new team of explorers travel to the distant galaxy where Atlantis is located, where a primitive human civilization is threatened by a sinister enemy.
Rising (Part 1 of 2): The first episode in this spin-off series from Stargate SG-1. Dr Elizabeth Weir steps through the gate to the Pegasus Galaxy and discovers Atlantis. (S1, ep 1)
Rising (Part 2 of 2): Unable to return to Earth, the crew looks for a new fuel source. They happen upon a settlement, but the villagers live in fear. The enemy is coming. (S1, ep 2)
A game causes one of the Athosian children to open a unit and unleash a dark entity. They soon realise that the harmless-looking cloud is anything but... (S1, ep 3)
Thirty Eight Minutes: Fleeing an encounter with the Wraith, the ship becomes lodged in the Stargate. And Sheppard is paralyzed by an alien symbiote feeding off his life force. (S1, ep 4)
Relationships are torn apart and tensions run high when Dr Weir suspects the crew's new friends the Athosians are harbouring a spy. (S1, ep 5)
Sheppard and the team visit a strange world in which no-one is over 24 years old. Ritual suicide is believed to keep the Wraith at bay. (S1, ep 6)
The team encounters a human civilization, the Hoffans, recovering from a Wraith attack. Do they have the knowledge to create a weapon to combat the enemy? (S1, ep 7)
Trade relations with a species called the Genii turn sour when the team discovers their new 'allies' have ulterior motives. Guest starring Colm Meaney. (S1, ep 8)
McKay's efforts to harness the energy of an alien planet's atmosphere allows for a trip to Earth - but the team may not be able to return to Atlantis. (S1, ep 9)
When a massive storm threatens the city, Atlantis is evacuated, allowing the team's newest enemy to move in. Contains strobing effects. (S1, ep 10)
Major Sheppard plays a dangerous game of cat and mouse with soldiers who have seized control of Atlantis and taken Weir and McKay hostage. (S1, ep 11)
When Sheppard's team investigate a downed Wraith ship, they find themselves stuck on a planet with a lone Wraith survivor. (S1, ep 12)
Several residents of Atlantis are infected with a deadly nanite virus, forcing a lockdown of the city. (S1, ep 13)
The team finds a paradise that would make an ideal sanctuary for those fleeing the Wraith. But the locals don't believe their goddess will permit it. (S1, ep 14)
When a woman is found in suspended animation, the team is shocked to discover it is Dr Weir, who tells them of her trip 10,000 years into Atlantis's past. (S1, ep 15)
The team searches for a valuable Zero Point Module that's rumoured to be hidden on the planet Dagan. (S1, ep 16)
The team is given a wonderful opportunity to send messages to loved ones back on Earth. But will the messages reach home? (S1, ep 17)
Plagued by nightmares, Teyla investigates what might be causing them. Alarmingly, she discovers she's a descendant of humans who were experimented on by the Wraith. (S1, ep 18)
The Siege Part 1: The season finale opens with Wraith ships on a mission to kill the team and take the lost city. Is reprogramming Atlantis to self-destruct the only solution? (S1, ep 19)
The Siege, Part 2: The Wraith are closing in... Could Atlantis really be doomed? (S1, ep 20)