When powerful aliens come through Earth's Stargate, Colonel Jack O'Neill returns to Abydos to retrieve Daniel Jackson, who has discovered that the alien transit system includes much more than the two planets.

Colonel O'Neill, leading the new SG-1, track Apophis back to the planet Chulak to rescue Sha're and Skaara, and befriend one of Apophis' Jaffa guards.

Pressed by the government to acquire new technologies, SG-1 is led to a world inhabited by a seemingly primative race. When Apophis arrives, SG-1 ambush him with disasterous consequences.

Teal'c must stand trial for a crime committed while he served as first prime of Apophis when a villager on an alien world identifies him as the Jaffa who killed his father.

Senator Kinsey arrives at the SGC to investigate the program and determine whether the great drain on the U.S. budget is worthwhile, prompting the team to recall missions from the past year.

SG-1 escapes through the Stargate before it is shut down, and learns that Daniel's alternate reality vision is true: Apophis is moving to attack Earth from above. The team must stop Apophis and his son, Klorel, who inhabits the body of their friend Skaara.

With SG-1 trapped on Klorel's ship, it seems that Earth is doomed as the Pyramid Ships prepare to destroy Earth.

The SG-1 team attempt to rescue Teal'c's son, who has been kidnapped and brainwashed by Apophis. Teal'c learns disturbing news about his wife.

Jackson discovers that his wife has returned to Abydos, and is nine months pregnant with the son of Apophis. O'Neill must keep the secret of the Stargate program from being uncovered.

Apophis, SG-1's greatest enemy, seeks sanctuary from Sokar and ends up near death in the S.G.C. infirmary.

O'Neill, Carter and Jackson awaken from stasis in what appears to be the S.G.C. -- almost 80 years in the future.

SG-1 must free an alternate reality Earth from a Goa'uld invasion after duplicates of Samantha Carter and Charles Kawalsky come through the quantum mirror.

SG-1 discovers a military camp where young men are trained to impersonate SGC personnel to infiltrate Earth.

When Major Carter's father Jacob is kidnapped by Sokar, the SG-1 team must infiltrate a prison moon designed to look like hell to rescue him.

SG-1 must escape a hellish prison moon, and one of their worst enemies.

A test gone wrong leaves Jack and Teal'c marooned in space aboard a damaged prototype attack ship

SG-1 must stop Apophis and Heru-ur from forming an alliance of their powerful forces, while Teal'c is captured and tortured by the Goa'uld.

Jackson's teammates notice a disturbing change in him when he is reunited with the Harcesis child and given the Goa'uld genetic memory.

SG-1 helps to evacuate the Tok'ra to a new base -- but matters are complicated when a spy reveals their location to Apophis. The team attempts a daring plan to take out the Goa'uld's powerful fleet.

SG-1 finds themselves stranded in a crippled ship in a distant galaxy -- with Apophis threatening to destroy them. Teal'c is brainwashed and made loyal to Apophis once again.

His mind altered by Apophis, Teal'c must undergo a ritual that takes him to the edge of death itself, in order for him to rediscover who he is.

A near-death trial causes Teal'c to imagine his life as very different from the one he knows, where he is a normal person living on Earth -- until he can no longer distinguish reality.

SG-1 travels back in time in a daring plan to steal a piece of Ancient technology from Ra, the powerful Goa'uld who ruled in ancient Egypt.

With the timeline changed by SG-1's actions in the distant past, an alternate version of SG-1 must use the newly-discovered time ship to set things right.