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.
The sci-fi smash returns for a fifth season. Colonel Carter attempts to rescue trapped Atlantis crew members, but Michael and his hybrids are in pursuit. (S5, ep 1)
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)
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)
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)
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)
Dr McKay falls gravely ill when a parasite attaches itself to his brain and the team prepare to say their final goodbyes. (S5, ep 6)
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)
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)
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)
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)
A pressure-cooker instalment of the sci-fi favourite: Sheppard must find Rodney McKay and Dr Daniel Jackson before Todd does. (S5, ep 11)
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)
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)
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)
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)
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)
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)
Dr Keller is taken over by an alien consciousness named Neeva and she's far from pleasant. Barnstorming, body-swapping action. (S5, ep 18)
It's CSI: Atlantis in this penultimate instalment. Set in an alternate reality, Sheppard is a homicide detective hunting down a serial killer terrorising Las Vegas. (S5, ep 19)
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)