The story of Stargate SG-1 begins about a year after the events of the feature film, when the United States government learns that an ancient alien device called the Stargate can access a network of such devices on a multitude of planets. SG-1 is an elite Air Force special operations team, one of more than two dozen teams from Earth who explore the galaxy and defend against alien threats such as the Goa'uld, Replicators, and the Ori.

Duncan MacLeod cannot die -- he is a 400-year-old immortal, who has seen his share of humanity's history. Still, he risks his life in battle against other immortals and tries to save people from harm.

As part of a deal with an intelligence agency to look for his missing brother, a renegade pilot goes on missions with an advanced battle helicopter.

David is a creatively stifled painter in desperate need of inspiration. As happenstance would have it, while seeking a job waiting tables, David stumbles upon a new muse in the form of a strapping diner owner named Matt. In short order the two bond over a shared love of art, and before long their passion for painting transforms into something more torrid. If it weren't for Matt's wife, Violet, everything would be perfect.