A small mountain community in Canada is devastated when a school bus accident leaves more than a dozen of its children dead. A big-city lawyer arrives to help the survivors' and victims' families prepare a class-action suit, but his efforts only seem to push the townspeople further apart. At the same time, one teenage survivor of the accident has to reckon with the loss of innocence brought about by a different kind of damage.

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.