A new gate will open. A lost city will rise again. A secret group of scientists have discovered the location of the famous lost city of Atlantis, but it's not on Earth. It's located in another galaxy altogether, the Pegasus galaxy. Stargate Atlantis, a spin off from the highly successful Stargate SG-1 series, follows a multinational scientific and military group, lead by Diplomat Dr. Elizabeth Weir (played by actress Torri Higginson), headed on a one way trip to Atlantis. Their mission to investigate the secrets of Atlantis, a city now known to have been built by ancient powerful beings, and bring whatever they discover back to Earth. They will be all on their own, with no means to return, with no means of rescue or support, unless they can find the technology they need in Atlantis to return them to Earth.

Episodes:

Season 1
Rising (1)
Rising (2)
Hide and Seek
Thirty-Eight Minutes
Suspicion
Childhood's End
Poisoning the Well
Underground
Home
The Storm (1)
The Eye (2)
The Defiant One
Hot Zone
Sanctuary
Before I Sleep
The Brotherhood
Letters from Pegasus
The Gift
The Siege
The Siege Part II

Season 2
The Siege: Part 3
The Intruder
Runner
Duet
Condemned
Trinity
Instinct
Conversion
Aurora
The Lost Boys
The Hive
Epiphany
Critical Mass
Grace Under Pressure
The Tower
The Long Goodbye
Coup D'etat
Michae
LInferno
Allies

Season 3
No Man's Land
Misbegotten
Irresistible
Sateda
Progeny
The Real World
Common Ground
McKay and Mrs. Miller
Phantoms
The Return: Part 1
The Return: Part 2
Echoes
Irresponsible
Tao of Rodney
The Game
The Ark
Sunday
Submersion
Vengeance
First Strike

Season 4
Adrift
Lifeline
Reunion
Doppelganger
Travelers
Tabula Rasa
Missing
The Seer
Miller's Crossing
This Mortal Coil
Be All My Sins Remember'd
Spoils of War
Quarantine
Harmony
Outcast
Trio
Midway
The Kindred: Part 1
The Kindred: Part 2
The Last Man

Season 5
Search and Rescue
The Seed
Broken Ties
The Daedalus Variations
Ghost in the Machine
The Shrine
Whispers
The Queen
Tracker
First Contact
The Lost Tribe
Outsiders
Inquisition
The Prodigal
Remnants
Brain Storm
Infection
Identity
Vegas
Enemy at the Gate