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.

An alien similar to Ra appears out of the Stargate, killing five soldiers and kidnapping another, a year after the original Stargate mission. A new team is assembled, including some old members, and they go in search of the missing soldier in order to find out how Ra could still be alive. Meanwhile, the alien Goa'uld kidnap Sha're and Skaara, implanting them with symbiotes and making them Goa'uld hosts.

In this documentary, Amanda Tapping, known as Samantha Carter from SG-1, shows the scientific background of the successful science fiction series "Stargate SG-1" and lets us take a look behind the scenes.

With interviews from cast, producers, and experts in the field of mythology and television, Behind the Mythology of Stargate SG-1 reveals how ten years of fantastic adventures have served to created Stargate's very own mythological superstructure.

The 200th episode of the venerated sci-fi series is discussed during this special.

Ba'al travels back in time and prevents the Stargate program from being started. SG-1 must somehow restore history.

SG-1 searches for an ancient weapon which could help them defeat the Ori, and discover it may be in the Ori's own home galaxy. As the Ori prepare to send ships through to the Milky Way to attack Earth, SG-1 travels to the Ori galaxy aboard the Odyssey. The International Oversight committee have their own plans and SG-1 finds themselves in a distant galaxy fighting two powerful enemies.