Season 1
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 challenges to protect their new home while exploring the galaxy and seeking new allies.
Episodes
1 Rising (1) Jul 15, 2004 
2 Rising (2) Jul 15, 2004 
3 Hide and Seek Jul 23, 2004 
4 Thirty Eight Minutes Jul 30, 2004 
5 Suspicion Aug 6, 2004 
6 Childhood's End Aug 13, 2004 
7 Poisoning the Well Aug 20, 2004 
8 Underground Aug 27, 2004 
9 Home Sep 10, 2004 
10 The Storm (1) Sep 17, 2004 
11 The Eye (2) Nov 8, 2004 
12 The Defiant One Nov 15, 2004 
13 Hot Zone Nov 22, 2004 
14 Sanctuary Nov 29, 2004 
15 Before I Sleep Dec 6, 2004 
16 The Brotherhood Jan 3, 2005 
17 Letters From Pegasus Jan 10, 2005 
18 The Gift Jan 17, 2005 
19 The Siege (1) Jan 24, 2005 
20 The Siege (2) Jan 31, 2005