Season 9
As one team member transitions into a new role, another is met with hesitation in season nine. Having learned of the Ori's plan to control the mortal plane, the team must find Merlin's secret weapon that may destroy the Ori and ensure the safety of Earth.
Episodes
1 Avalon (1) Jul 15, 2005 
2 Avalon (2) Jul 22, 2005 
3 Origin (3) Jul 29, 2005 
4 The Ties That Bind Aug 5, 2005 
5 The Powers That Be Aug 12, 2005 
6 Beachhead Aug 19, 2005 
7 Ex Deus Machina Aug 26, 2005 
8 Babylon Sep 9, 2005 
9 Prototype Sep 16, 2005 
10 The Fourth Horseman (1) Sep 16, 2005 
11 The Fourth Horseman (2) Jan 6, 2006 
12 Collateral Damage Jan 13, 2006 
13 Ripple Effect Jan 20, 2006 
14 Stronghold Jan 27, 2006 
15 Ethon Feb 3, 2006 
16 Off the Grid Feb 10, 2006 
17 The Scourge Feb 17, 2006 
18 Arthur's Mantle Feb 24, 2006 
19 Crusade Mar 3, 2006 
20 Camelot Mar 10, 2006