Enemy At The Gate: The sci-fi favourite reaches its 100th episode and prepares to make its final puddle-jump. Will the Wraith threat be eliminated? Last ever episode. (S5, ep 20) [S]
Identity: Dr Keller is taken over by an alien consciousness named Neeva and she's far from pleasant. Barnstorming, body-swapping action. (S5, ep 18) [S]
Infection: Sheppard and crew stumble upon a seemingly abandoned Wraith vessel. Ignoring the old adage that appearances can be deceiving, they decide to investigate. (S5, ep 17) [S]
Brain Storm: Rodney's 'friend' Malcolm Tunney unveils a device that promises to extinguish the threat of global warming. His demonstration certainly stirs up a storm. (S5, ep 16) [S]
Remnants: Sheppard is abducted and held captive by an old enemy whom he believed to be dead. Meanwhile, Atlantis discovers the existence of an ancient alien race. (S5, ep15) [S]
The Prodigal: Michael and a few genetically-modified friends infiltrate Atlantis and hold Teyla hostage. Can the team get to her before it's too late? (S5, ep14) [S]
Inquisition: The Atlantis crew are on troubled ground when a newly formed coalition of human worlds puts them on trial for alleged crimes against the Pegasus galaxy. (S5, ep 13) [S]
Outsiders: The survivors of both a plague concocted by Michael and a deadly Wraith attack face a new danger from the people who originally gave them shelter. (S5, ep 12) [S]
The Lost Tribe: A pressure-cooker instalment of the sci-fi favourite: Sheppard must find Rodney McKay and Dr Daniel Jackson before Todd does. (S5, ep 11) [S]
First Contact: Atlantis encounters a mysterious alien race when Dr McKay and Dr Jackson come across a secret lab. Do the visitors have good intentions? (S5, ep 10) [S]
Tracker: The team comes to the aid of a village under Wraith attack. In a twist in the tale, one of their own is kidnapped. Can Ronon rescue his comrade in time? (S5, ep 9) [S]
The Queen: When Dr Keller maintains that she can extinguish the Wraith appetite for humans for good, Teyla embarks on a dangerous mission disguised as a Wraith queen. (S5, ep 8) [S]
Whispers: Sheppard and Beckett join Teldy and co when they find another of Michael's labs. Whilst exploring a nearby town smothered in fog, they discover they're not alone. (S5, ep 7) [S]
The Ghost In The Machine: When every single system in the Atlantis is hit by power disruptions, the crew must determine what is causing the problems before it's too late. (S5, ep 5) [S]
The Daedalus Variations: The crew investigates a duplicate Daedalus in orbit. Once aboard, the team are thrown into an alternate reality. Will they find a way back? (S5, ep 4) [S]
Broken Ties: Ronon is ambushed by treacherous Tyre during an off-world mission and handed over to the Wraith. In a race against time, can the Stargate team come to his rescue? (S5 ep 3) [S]
The Seed: Dr Jennifer Keller falls foul of a mysterious alien virus. Desperate to find an antidote, the team release Dr Carson from the stasis chamber. (S5, ep 2) [S]
The Last Man: Season four comes to a shattering climax when, having failed to locate Teyla, Sheppard returns to Atlantis to find the city abandoned and all systems dead. (S4, ep 20) [S]
Midway: When Ronon comes under review by the IOA, Carter asks Teal'c to mentor him, but the appraisal is put on hold when the Wraith target the Midway station. (S4, ep 17) [S]
Quarantine: When an alarm sounds throughout the city, initiating a quarantine lock down, the Atlantis team find themselves trapped in various sections of the city. (S4, ep 13) [S]
Spoils Of War: The team successfully salvage a partially damaged Hive ship and in the process retrieve some critical information that may help in their war against the Wraith. (S4, ep 12) [S]
This Mortal Coil: The Atlantis team's worst fears are realised when a mysterious probe crashes into the city, and the crew are convinced the Replicators have found them. (S4, ep 10) [S]
The Seer: An Oracle visits Atlantis, warning the team that Wraith hive ships are heading in their direction. He also exposes a deep secret Teyla has yet to reveal. (S4, ep 8) [S]
Missing: Teyla and Dr Keller visit New Athos in search of Teyla's people, who have gone missing from their planet. Trouble strikes when primitive warriors hunt the pair down. (S4, ep 7) [S]
Tabula Rasa: A deadly infection threatens the Atlantis expedition when the team contracts a virus that causes memory loss. Ronan and Teyla must find a cure. (S4, ep 6) [S]
Travelers: An unfamiliar race, known as the Travelers, hunts down the Atlantis expedition after hearing of the team's notorious ancient techniques used to fight the Wraith. (S4, ep 5) [S]
Doppelganger: Stargate delves into the past when Sheppard comes across a crystalline species similar to one that Jack O'Neill encountered 10 years ago. (S4, ep 4) [S]
Reunion: Ronon is reunited with a group of his fellow Satedans and is forced to decide where his allegiance lies, with the people from his old civilisation or with Atlantis. (S4, ep 3) [S]
Lifeline: It's a race against time to find the missing city of Atlantis as the team embarks on a daring infiltration to steal a ZPM from the Replicators. (S4, ep 2) [S]
First Strike: A failed attack on a Replicator armada forces McKay to follow in the footsteps of the Ancients and take a drastic step to save Atlantis from destruction. (S3, ep 20) [S]
Submersion: While searching for a geothermal drilling station on the ocean floor, the team unknowingly awakens a Wraith queen who has lain dormant for thousands of years. (S3, ep 18) [S]
Sunday: The Atlantis team unwinds during a city wide holiday, but their rest and relaxation is cut short when a deadly explosion rips through the city. (S3, ep 17) [S]
The Ark: After discovering an antiquated space station, Sheppard and his team mistakenly awaken a race of people who have been frozen in stasis for thousands of years. (S3, ep 16) [S]
The Game: Upon realising that a simulation game they have been playing is real, McKay and Sheppard are forced to put their petty squabbles aside. (S3, ep 15) [S]
Tao Of Rodney: Zapped by a mysterious device left running by the Ancients, Rodney McKay (David Hewlett) begins to evolve into a super human. (S3, ep 14) [S]
Irresponsible: When the team finds Lucius up to his old tricks again they try to blow the whistle on his scamming ways, but are drawn into a fight with Kolya and his men. (S3, ep 13) [S]
Echoes: When the people of Atlantis begin to have ghostly visions, Teyla believes the apparitions they are seeing are actually Ancients, warning them of a great danger. (S3, ep 12) [S]
The Return (Part 2): The team goes against orders to launch a rescue attempt to free General Jack O'Neill, so that they can try to save Atlantis from Replicator control. (S3, ep 11) [S]
The Return (Part 1): The Atlantis expedition is stunned to learn that a ship of Ancients is returning to reclaim their lost city. Guest starring Richard Dean Anderson. (S3, ep 10) [S]
Phantoms: While on a mission to rescue a lost team, Sheppard and Ronon are placed in serious danger when they are influenced by a mind-altering device created by the Wraith. (S3, ep 9) [S]
McKay And Mrs Miller: McKay is reunited with his estranged sister, who gave up a promising career to raise a family. Will she put their differences aside to help the SG-1 team? (S3, ep 8) [S]
Grace Under Pressure: McKay gets trapped underwater in a sinking Puddle Jumper and must rely on Samantha Carter for his survival. Will he survive? (S2, ep 14) [S]
Epiphany: Sheppard is pulled through a mysterious portal and trapped in a world inhabited by ancestors of the Ancients, where a violent beast is on the rampage. (S2, ep 12) [S]
The Hive: The enzyme's grip on the team begins to lessen, sending them into withdrawal as they try to escape from the Wraith hive ship. (S2, ep 11) [S]
Aurora: The crew discovers a decrepit warship whose ancient crew are frozen in stasis pods and live in a virtual world. But it's a world infiltrated by a Wraith in disguise... (S2, ep 9) [S]
Conversion: Dr Beckett realises that the 'retrovirus' Ellia ingested is now in Sheppard's bloodstream... and he's mutating into the very creature that attacked him. (S2, ep 8) [S]