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A secret military team, SG-1, is formed to explore other planets through the recently discovered Stargates.

Colonel Jack O'Neill is brought out of retirement to lead a new expedition back to Abydos, only to find an old friend, a new enemy and a far wider use of the Stargate.

A solar flare sends SG-1 back in time thirty years to 1969. Captured by military police at Cheyenne Mountain, they escape with the help of a young Hammond and then must find the Stargate so they can return to the present.

SG-1 makes contact with the Aschen, unaware that their homeworld is one they were warned previously from the future to be considered off-limits.

In 2010, Robert Kinsey is president of a brave new world since he concluded the alliance with the Aschen, a race discovered by SG-1 which lets humanity enjoy its far advanced science and technology, including a vaccine against aging. Sam is now a civilian scientist, married to ambassador Joe Faxon, whose only worry is failing to get pregnant. When she double-checks the Aschen doctor Mollem's computer with Dr. Fraiser, who felt superfluous given superior medicine, they discover human fertility is down 90% worldwide in three years. Sam, Daniel and Teal'c turn to retired General Jack, who always warned against handing over technological control, for a daring plan to turn the clock back like General Hammond did once, sending a message to their past with the exact time of a solar flare, which Sam can calculate using the Aschen computer. Only one ingredient is out of their reach: the GDO device to control the Stargate's iris, which is in the White House. Sam implores her husband Joe to steal it, but he has a secret as well as sincere objections.

When Teal'c is trapped in the Stargate buffer, the team must juggle the technical challenges along with personal, interdepartmental and diplomatic rivalries to rescue him in time.

After a cataclysmic meteorite bombardment, Col. Jack O'Neill finds himself stranded on a primitive planet with its Stargate apparently permanently inaccessible.

Stargate Command opens a wormhole to a planet with a black hole in orbit.

When a "chosen" boy found on planet Abydos is brought to SGC, he sends a telepathic message, causing Daniel Jackson's personality to undergo disturbing changes. Will the rest of SG-1 be able to solve the mystery of the boy's origin before he becomes a power-hungry warmonger?

O'Neill's symbiont Kanan drags him to a planet ruled by the Goa'uld Ba'al, where Kanan was undercover. Ba'al captures and tortures O'Neil, whose only hope may lie with - Daniel Jackson?!?

Having obtained permission to live off the base, Teal'c rents an apartment, telling neighbors that he has recently arrived from Mozambique. He's under orders to keep a low profile but can't seem to help himself when it comes to helping his neighbors. He helps one who is about to be assaulted by three thugs, but it's his next-door neighbor who seems to need assistance. Krista is having problems with her boyfriend, Doug. Teal'c soon realizes that Doug is beating her and warns him that should he hurt her, Teal'c will kill him. It all becomes very difficult when Doug is found dead in Krista's apartment. Daniel Jackson soon after receives an offer - translate a Goa'uld text, and he will get ironclad evidence that Teal'c is innocent. Meanwhile, Carter is shocked when her boyfriend Pete Shanahan tells he asked for a transfer to the local police department and asks her to marry him.

The Tok'ra are forced to evacuate their newly established base under attack from the Goa'uld. They flee to the SGC's Alpha site. Tensions rise between the allied factions, the Free Jaffa, Tau'ri, and Tok'ra. Jacob and Selmak feel the end of the Tok'ra is near and Sam finds a Naquadah generator has been sabotaged to function as a bomb. Jack suspects the recently arrived Tok'ra and attempts to weed out the traitor.

Sam manages to activate an Ancient device they found at the Glastonbury site and she and Mitchell are shifted into a phase that makes them invisible to everyone. Daniel soon figures out just what is going on but Dr. Lee's proposed solution sends Daniel to the same plane as Sam and Mitchell. There he is able to translate information explaining that Merlin had created a weapon against the Ori - and provides a gate address where it can be found. Meanwhile, Teal'c travels to a Jaffa planet that has sent out a distress call. The two events are related.

After being rendered unconscious during an expedition, Carter's subsequently-ordered furlough is interrupted by a mysterious being with a message and growing affection for her.

With a new commander of the SGC comes a new leader of SG-1, Lt. Col. Cameron Mitchell, a former fighter pilot who flew an F-302 in the battle over Antarctica. However, he is deterred by the fact that all the other members of SG-1 are leaving for other ventures: Teal'c to manage the Jaffa Nation, Carter to Area 51 for alien R&D, and Dr. Jackson to Atlantis as an Ancient expert. Mitchell endeavors to keep the members of SG-1 for himself, but they are increasingly tough to convince.

Upon finding Merlin's testing grounds, Dr. Jackson, Teal'c, Col. Mitchell, and Vala uncover the hidden treasure including a book that tells the story of the Ancients coming to Earth from another galaxy and a strange alien device.

Dr. Lee is adapting a virtual reality chair for use as a training device. Teal'c thinks its current scenario is all too easy and agrees to work with them to make it more realistic. He enters the game scenario and is quickly "killed" at which point the chair shocks him. Lee says it must be part of its basic construct. As the scenario resets - it's an invasion of SGC by Goa'uld - Teal'c is repeatedly killed and shocked putting him in danger. The computer program is set up to learn after each scenario and the challenge for Teal'c increases at every turn. Daniel volunteers to enter the game as well to see if together they can find a way out.

To save his job, Dr. Felger tests a new virus on the Stargate Network to help control it and it ends up disabling it instead.

SG-1 investigates a planet that is said to be the home of the Warriors of Sodan, a legendary tribe of Jaffa said to have not served the Goa'uld in 5,000 years. In an encounter with the warriors, Mitchell deals a deadly blow to one of the Sodan and is captured and taken to their village. There he awaits a battle to the death as punishment for his crime.

While exploring a new planet, Teal'c is stung by a giant insect whose venom causes a terrifying transformation.

A Prior of the Ori has established an ever-growing forcefield on a Jaffa-controlled planet called Kalana. A minor Goa'uld named Nerus, who engineered the multiple Gate connections required for the defeat of the Replicators, comes to the SGC with information on the event and offers his help.

When Daniel's Unas friend, Chaka, is captured by another world's slavers, SG-1 goes to that world to rescue him.

The SG-1 team awake to find they have lost their memories. They believe they are workers in an underground power station. They are told that they are helping to preserve life during an ice age. In truth, they are slave labor to a huge domed city above. When Teal'c starts to recover his memory and is given another amnesia treatment, he forgets his Kelno'reem and starts to die. Will the others recover their memories in time to save him?

With the death of Omoc, the subsequent sudden Tollan reconsideration of their tech embargo leads to SG-1 suspecting a government conspiracy.

After being saved by a group of free female Jaffa, SG-1 is taken to the females' home world to meet their leader, Ishta. Ishta proposes an alliance between her all-female rebel group, Haktil, and the Tau'ri. The Tau'ri offer her Tretonin to supplant their practice of taking the symbiotes from defeated Jaffa in the service of the Goa'uld. However, since Tretonin has only had two test subjects, Teal'c and Bra'tac, they are cautious to spread it among their ranks.