Stargate: The Ark of Truth is a 2008 Canadian-American, military science fiction, direct-to-video film in the Stargate franchise, acting as a sequel to the television series Stargate SG-1. It is the first of two Stargate SG-1 direct-to-DVD films, the second one being Stargate: Continuum.

References:
https://en.wikipedia.org/wiki/Stargate:_The_Ark_of_Truth