Colonel Jack O'Neill is brought out of retirement by General Hammond to lead a team on a new Stargate mission after aliens come through the Stargate and attack its protectors.
O'Neill and a group of soldiers track the aliens responsible for the Stargate guard killings to a planet ruled by snake creatures known as Goa'ulds, who seek out hosts across the galaxy.
An alien parasite infests one of the SG-1 team in an effort to get itself through the Stargate. O'Neill wants to bring the alien Teal'c, who risked his life to save O'Neill's, aboard the SG-1 team.
After rescuing the son of the Shavadai race's chief, Carter finds herself fighting to bring about the equality of women on their patriarchal planet.
On another world, a virus renders intelligent people primitive.
On a planet ravaged by solar radiation, a commander assumes the role of a god.
O'Neill finds a crystal that creates an image of himself and his dead son.
O'Neill and his crew travel to a planet where fairies turn indigenous species invisible in order to protect them.
The SG-1 team tries to determine a cure for whatever is rapidly aging O'Neill and the people of Argos.
O'Neill and Teal'c find themselves trapped and imprisoned on a planet where Norse gods rule.
The crew goes in search of a man who passed through the portal in 1945.
SG-1 goes back to Chulak to bring back larvae and rescue Teal'c's son.
Daniel is held captive by a grieving extraterrestrial.
In the guise of an ancient Egyptian fertility goddess, a Goa'uld starts seducing the crew's men.
The only survivor of a disease that killed the entire population of a planet comes to Earth.
SG-1 travel through the Stargate and Teal'c recognizes the destination as the Byrsa home, an area of frequent Goa'uld activity. When he recognized by a Byrsa and accused of killing the Byrsa's father, he is put on a unique type of justice trial.
The Stargate crew rescues survivors of a dying planet.
Carter and O'Neill wind up trapped in an Antarctic glacier.
The steward of a dying planet transforms the Stargate crew into robots.
Daniel winds up on a version of Earth where the Goa'uld have taken over.
The SG-1 team's future is jeopardized by a politician who deems the Stargate project useless and the Goa'uld harmless, and who wishes to dismantle the unit and bury the Stargate once and for all.
Defying the government's shutdown, the SG-1 team use the Stargate to go to the place where they believe an attack on Earth will come from only to land on a Goa'uld vessel with no apparent means home.