with 4 episodes premiered on July 3, 2004

with 20 episodes premiered on July 15, 2004

The Atlantis expedition team, led by Dr. Elizabeth Weir, arrives in the Pegasus Galaxy and discovers the lost city of Atlantis. They encounter a powerful new enemy, the Wraith, and face various chall… see more

with 20 episodes premiered on July 15, 2005

As the Wraith threat intensifies, the team strives to find ways to defend Atlantis and the Pegasus Galaxy from impending invasion. Key episodes focus on breakthroughs in ancient technology, dangerous… see more

with 20 episodes premiered on July 13, 2006

The team faces escalating conflicts with both old and new adversaries, including the Wraith and a deadly new faction. The discovery of a potential game-changing technology introduces new ethical dile… see more

with 20 episodes premiered on September 27, 2007

With changes in leadership and new allies, the team continues to battle the Wraith and confront new existential threats. Personal dynamics shift as members struggle with loss and make significant cho… see more

with 20 episodes premiered on July 10, 2008

As Atlantis faces its greatest threats yet, the team must rely on unexpected alliances and new technologies to safeguard their city and the galaxy. The season builds toward a climactic confrontation … see more