An interstellar teleportation device, found in Egypt, leads to a planet with humans resembling ancient Egyptians who worship the god Ra.

SG-1 search for an Ancient artifact called the Ark of Truth to finally defeat the Ori. However, the Ark is in the Ori's galaxy.

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

In 1939, Professor Paul Langford and his daughter Catherine are still grappling with the mysteries of the ancient relic they discovered in the Egyptian desert more than ten years ago. With war looming in Europe and funding running out, these brilliant minds are approaching their lowest ebb. Little do they know, answers are about to present themselves in a dangerous form, when the Nazi Occultist Dr. Wilhelm Brücke approaches their facility with a sinister motive. Enlisting the help of two young soldiers, Catherine must use all of her wit and nous as she and her new allies embark on an adventure into the unknown to rescue her father, and save the Earth from an unimaginable darkness.

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.

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.