A team of explorers made up of soldiers and scientists travels through a Stargate, an ancient portal to other planets. They use the Stargate to explore new worlds, forge ties with friendly civilizations and protect Earth from hostile forces. The TV series is based on the theatrical film `Stargate'.
Redemption (Part 1 of 2): Unable to return to his home planet, Jonas decides to finish what Daniel started. Plus, the Stargate malfunctions. (S6, ep 1)
Redemption (Part 2 of 2): With the Stargate transformed into a timebomb, Earth's only hope lies in a gambit by SG-1 that could result in the loss of the portal forever. (S6, ep 2)
Trapped on a Goa'uld mothership at the bottom of the ocean by Anubis, the SG1 team discover the craft is on self-destruct and that they only have 17 minutes to get out. (S6, ep 3)
When O'Neill contracts a virus from a mysterious female found frozen in the ice, it becomes clear that his only hope of survival is to accept a symbiote from the To'kra. (S6, ep 4)
SG-1 investigates a sleepy town on the Oregon coast whose inhabitants harbour a dark secret - the zombie-like townspeople turn out to be their worst nightmare. (S6, ep 5)
Michael Shanks returns for a gripping episode which sees Colonel O'Neill tortured to death and repeatedly revived by an evil System Lord. (S6, ep 6)
Jonas convinces the Pentagon that a sinister plot is afoot on his home planet and that only an SG-1 away mission can save his people. (S6, ep 7)
When SG-1 is captured by the Goa'uld, their very survival rests with two unlikely heroes. Enterprise's John Billingsley guest stars. (S6, ep 8)
An invisible assassin goes on a killing spree, threatening to turn the Tok'ra and their rebel Jaffa allies against each other. (S6, ep 9)
A flawed miracle drug threatens to devastate the Pangeran civilisation, leading SG-1 to a shocking discovery about the origins of the Tok'ra. (S6, ep 10)
Hostile forces commandeer an alien spaceship that government scientists are building in an underground bunker. (S6, ep 11)
When the Asgard homeworld is overrun by replicators in an advanced state of evolution, Thor enlists SG-1 to save the day. (S6, ep 12)
An ancient artefact emits a contagious energy field that makes people see horrific visions of alien beings. (S6, ep 13)
When a politician is assassinated, O'Neill is the main suspect because of indisputable evidence against him. Can his friends at the SGC clear him? (S6, ep 14)
O'Neill and Maybourne are accidently transported to a deserted moon and must be rescued before they kill each other. (S6, ep 15)
SG-1 encounter a group of mutants in an off-world laboratory. (S6, ep 16)
The Stargate programme is revealed to ambassadors from Britain, France and China. (S6, ep 17)
SG-1 encounters the crew of a stranded ship struggling to stay alive on a remote planet. (S6, ep 18)
Undergoing an experiment that could end his need for a symbiote, Teal'c is trapped in a dreamlike world that features all the characters from Stargate's past. (S6, ep 19)
SG-1 and the crew of the X-303 are stranded in space after a failed attempt to test the naquadriah hyperdrive. They must search for a stargate in order to get home. (S6, ep 20)
Jonah's precognitive abilities are unearthed and SG-1 realise that he can see into the future - but what he sees doesn't bode well for Sam... (S6, ep 21)
SG-1 return to Abydos, the first off-world location ever visited by O'Neill and Jackson, to defend it from Anubis who wants the Eye of Ra. (S6, ep 22)