#1 - Lost City (2) 8.81
Season 7 - Episode 22
Anubis begins a systematic assault on Earth, and the planet's only hope of salvation depends on whether SG-1 can find the Ancients' mythical Lost City.
#2 - Window of Opportunity 8.72
Season 4 - Episode 6
O'Neill and Teal'c are caught in a time loop in the SGC, and must relive the same 10 hours over and over again.
#3 - Lost City (1) 8.63
Season 7 - Episode 21
O'Neill goes to great lengths to keep the Ancients' knowledge from falling into Goa'uld hands when the team discovers a second repository. The President replaces General Hammond with a civilian diplomat.
#4 - The Fifth Race 8.57
Season 2 - Episode 15
O'Neill becomes the unwilling receptacle for a library of alien knowledge.
#5 - Unending 8.40
Season 10 - Episode 20
Trapped on board the Odyssey, the members of SG-1 must live out the rest of their lives together when Carter activates a time dilation field to save the ship from destruction.
#6 - New Order (2) 8.39
Season 8 - Episode 2
While the Goa'uld threaten to attack Earth, SG-1 and the Asgard make a last, desperate stand against the Replicators, which have captured Major Carter and invaded the last outpost of the Asgard civilization.
#7 - Reckoning (2) 8.37
Season 8 - Episode 17
The fate of the galaxy hangs in the balance as Sam and Jacob search for the only weapon capable of stopping the Replicator onslaught. O'Neill leads a defense of the S.G.C., while Daniel squares off against Replicator Carter.
#8 - Within the Serpent's Grasp 8.36
Season 1 - Episode 22
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.
#9 - The Serpent's Lair 8.34
Season 2 - Episode 1
With SG-1 trapped on Klorel's ship, it seems that Earth is doomed as the Pyramid Ships prepare to destroy Earth.
#10 - Nemesis (1) 8.34
Season 3 - Episode 22
SG-1 faces creatures of mass destruction that even the Asgard can't control, and must destroy Thor's infested vessel before the Replicator bugs reach Earth.
#11 - New Order (1) 8.30
Season 8 - Episode 1
Carter and Teal'c go in search of the Asgard to try and save Colonel O'Neill, but discover that the Asgard's enemy has returned with a vengeance. The System Lords seek an alliance with Earth against a common enemy.
#12 - Heroes (2) 8.28
Season 7 - Episode 18
SG-1 is called into action while a film crew is documenting the Stargate program, but the S.G.C. comes under investigation after the mission goes terribly wrong.
#13 - Camelot 8.28
Season 9 - Episode 20
SG-1 discovers the village of Camelot on an alien world, and must face Merlin's security system when they go in search of an Ancient weapon. Elsewhere, Earth and its allies assemble a fleet when a working Ori Supergate is discovered.
#14 - Meridian 8.26
Season 5 - Episode 21
Daniel Jackson is exposed to a lethal dose of radiation while visiting an alien civilization that is building a weapon of mass destruction.
#15 - Point of View 8.25
Season 3 - Episode 6
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.
#16 - Reckoning (1) 8.25
Season 8 - Episode 16
The Replicators begin a systematic attack of the Goa'uld, forcing Baal to come to Earth for help. The Jaffa Resistance risk their entire movement in an attempt to retake a holy city in Baal's domain.
#17 - 1969 8.25
Season 2 - Episode 21
A cosmic accident causes SG-1 to be sent back 30 years into Earth's past, where they must locate the Stargate and find a way home.
#18 - The Pegasus Project 8.24
Season 10 - Episode 3
Daniel and Vala travel to Atlantis in search of Merlin's anti-Ori weapon, while Sam, and Mitchell join forces with Dr. McKay to lock out the Ori supergate.
#19 - The Tok'ra (2) 8.22
Season 2 - Episode 12
While SG-1 tries to form an alliance with the Tok'ra, a spy betrays the rebels to the Goa'uld. Jacob Carter finds that the Tok'ra may be his only hope of survival
#20 - Revelations 8.22
Season 5 - Episode 22
SG-1 must come to the rescue of their once-powerful allies when the Goa'uld attack a secret Asgard laboratory.
#21 - There But For the Grace of God 8.22
Season 1 - Episode 20
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.
#22 - Small Victories (2) 8.21
Season 4 - Episode 1
O'Neill and Teal'c risk their lives to keep the Replicator bugs from gaining a foothold on Earth, while Carter helps the Asgard fend off a Replicator invasion.
#23 - Full Circle 8.20
Season 6 - Episode 22
SG-1 is called to defend the people of Abydos from the Goa'uld once again when they learn that Anubis, in search of a powerful device, is about to attack.
#24 - Evolution (2) 8.20
Season 7 - Episode 12
O'Neill seeks help from a former comrade to rescue Daniel and Dr. Lee, who have been kidnapped in Central America. Carter, Teal'c and Jacob infiltrate Anubis' super-soldier facility.
#25 - Prometheus (1) 8.20
Season 6 - Episode 11
A news reporter threatens to expose a top-secret military project, but when Carter and Jonas give her a tour of the X-303, they discover that she is a pawn in a much larger plot.