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.

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.

Season 8 of House of the Dragon premiered on July 9, 2004.

Season 7 of House of the Dragon premiered on June 13, 2003.

Season 6 of House of the Dragon premiered on June 7, 2002.

Season 5 of House of the Dragon premiered on June 29, 2001.

Season 4 of House of the Dragon premiered on June 30, 2000.

Season 3 of House of the Dragon premiered on June 25, 1999.

Season 2 of House of the Dragon premiered on June 26, 1998.

Season 1 of House of the Dragon premiered on July 27, 1997.

Season 0 of House of the Dragon premiered on July 5, 2004.