2005 | 20 Episodes
Season 9 of Stargate SG-1 premiered on July 15, 2005.
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.
2006 | 20 Episodes
Season 10 of Stargate SG-1 premiered on July 14, 2006.
As the team embarks upon its tenth year, Vala, a former Goa'uld host turned freedom-fighter, joins SG-1 in their battle to defend the galaxy from the holy war of the Ori. Having discovered the existence of a weapon capable of defeating the Ori, the team is now in a race against time to find it before more systems fall to the influence of the Priors and the threat of the newly arrived Origin fleet.
The season is continued with direct-to-DVD film Stargate: The Ark of Truth.