Season 2

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 alliances, and a desperate search for a means to stop their enemies once and for all.

Air date	Jul 15, 2005
Episodes	20

Episodes

1. The Siege (3) Jul 15, 2005 · 42 min · ★ 8.5
2. The Intruder Jul 22, 2005 · 44 min · ★ 7.2
3. Runner Jul 29, 2005 · 42 min · ★ 7.9
4. Duet Aug 5, 2005 · 42 min · ★ 8.0
5. Condemned Aug 12, 2005 · 42 min · ★ 7.7
6. Trinity Aug 19, 2005 · 44 min · ★ 7.8
7. Instinct Aug 26, 2005 · 44 min · ★ 7.4
8. Conversion Sep 9, 2005 · 42 min · ★ 7.3
9. Aurora Sep 23, 2005 · 44 min · ★ 8.2
10. The Lost Boys (1) Sep 23, 2005 · 44 min · ★ 7.4
11. The Hive (2) Nov 16, 2005 · 44 min · ★ 7.6
12. Epiphany Nov 28, 2005 · 44 min · ★ 7.6
13. Critical Mass Dec 5, 2005 · 44 min · ★ 7.6
14. Grace Under Pressure Dec 10, 2005 · 44 min · ★ 7.6
15. The Tower Dec 19, 2005 · 44 min · ★ 7.4
16. The Long Goodbye Jan 2, 2006 · 44 min · ★ 7.2
17. Coup D'etat Jan 9, 2006 · 44 min · ★ 7.7
18. Michael Jan 16, 2006 · 44 min · ★ 7.9
19. Inferno Jan 23, 2006 · 44 min · ★ 8.1
20. Allies (1) Jan 30, 2006 · 44 min · ★ 8.3