Major Kawalsky is possessed by a Goa'uld, and the SGC must find a way to remove it without killing him.

An alien artifact transports Daniel to an alternate reality, where he is not a part of the Stargate program and the Goa'uld -- led by Teal'c -- are invading Earth.

General Hammond and the Pentagon reveal the existence of the Stargate to other world governments, and must defend the fact that the program is operated by the United States military.

Members of SG-1 become infected with an alien virus that turns them into primitive beings. Dr. Fraiser must find a cure to save the team and the alien population from whom it was contracted.

Earth provides sanctuary for Vala's estranged, con artist father after he provides intel about a Jaffa plot to attack the planet.

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.

A group of primitive aliens begin to fall deathly ill after SG-1 arrives.

The impending wedding of his son is the least of Teal'c's worries when the Hak'tyl plan an uprising against the Goa'uld Moloc, driving a wedge between Teal'c and Ishta.

Jackson becomes addicted to the effects of a Goa'uld sarcophagus, and falls for the planet's manipulative princess.

SG-1 finds a medieval Christian society terrorized by Sokar and the Unas, and is accused of being possessed by demons.

Cassandra mysteriously falls ill, sending SG-1 back to her home planet -- where they uncover a dark Goa'uld secret.

SG-1 investigates a secret N.I.D. laboratory, where a ruthless scientist has used cloning technology to create a Goa'uld-human hybrid.

SG-1 finds a deserted Goa'uld palace, where a beautiful device causes suicidal tendencies.

The team returns to Earth with a piece of technology that allows them to see alien creatures everywhere, and must attempt to contain the problem when it spreads beyond the base.

The team finds a fugitive colony of Jaffa women, who must prey on other Jaffa to acquire symbiotes.

The newly-elected president is debriefed about the Stargate program, and Vice President Kinsey makes a new play for control of the program.

A tour of an off-world research base for a group of foreign diplomats turns dangerous when an insidious insect species gets loose.

Teal'c discovers a world where people are being savagely attacked by an elusive creature, leading SG-1 to a stunning discovery about its potential origin.

An alien civilization is forced to reconsider their views on women when Carter rebels against their social customs.

SG-1 is imprisoned in a virtual reality realm and forced to relive the worst moments of their lives over and over.

Daniel is stranded on another planet after the team's arrival on an alien world sparks a violent civil war.

Teal'c returns to Chulak to stop his people from implanting his son with a larval Goa'uld.

Teal'c is infected with deadly venom from a giant insect, and begins a terrible transformation. When he escapes the S.G.C., SG-1 must find him before Colonel Maybourne does.

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