History StargateSG1 / AToF

* ColdEquation: In "Tangent", Teal'c and O'Neill are AlmostOutOfOxygen and expect rescue in twenty-four hours, twelve hours after they will have died from CO[[subscript:2]] poisoning. They recognize that if there was only one person left they ''might'' survive to rescue, and Teal'c puts himself in a deep meditation to stretch out their air supply.

** [[spoiler:The teenage clone of O'Neill]] was a victim of genetic degradation because Loki had been sloppy and irresponsible in the cloning procedure.

** In "Fragile Balance", Teen!O'Neill does not handle the realization that he is a (dying) clone very well.

** The teenage clone O'Neill was a victim of genetic degradation because Loki had been sloppy and irresponsible in the cloning procedure.

** In the spin-off novel ''Apocalypse'' trilogy, SG-1 travel into an alternate future where the NID's illegal offworld activities were never stopped, resulting in Earth being abandoned by their offworld allies and decimated by an attack from the Goa'uld. Even worse, once Atlantis rose to the surface in the Pegasus galaxy following the ZPMs being drained, the Wraith were able to take control of the city-ship with the aid of a Wraith worshiper who had the Ancient gene, resulting in the Milky Way galaxy being caught in a war between the Wraith and the Goa'uld, with a major player in this future being the Goa'uld Hestia, who has [[spoiler:taken Janet Frasier as her host and manipulated Ry'ac to act as her First Prime]].

** The Tobin, the builders of a mine field used a neutral territory by Gu'ald system lords, had a number system based on one from ancient Earth, except they had added a zero to the pre-existing numerals (several branches of mathematics that form the foundations of various high-technologies require zero to work). This caused a moment of panic when SG-1 try and initially fail to disarm one of these mines.

* AdaptationExpansion: See ''Film/{{Stargate}}'', the original film.

* ArtisticLicenseAstronomy: In "Children of the Gods" Sam suggests that the reason none of the gate addresses on the Abydos cartouche still work is because the expansion of the universe has changed the stellar coordinates they represent. While this could be true for 8-symbol extra-galactic addresses, e.g. the Asgard homeworlds or Atlantis, it's RightForTheWrongReasons within the Milky Way: the stars ''do'' move relative to Earth over the described timescales, but because of differing orbits around the galactic core (e.g. [[https://en.wikipedia.org/wiki/Kapteyn%27s_Star Kapteyn's Star]] orbits retrograde and at an unusual angle) rather than universal expansion.

* CombatPragmatist: In the Stargate setting this seems to be [[PlanetOfHats Earth's hat]]. Most advanced civilizations rely solely upon technological superiority to win conflicts and lose badly when faced by a superior foe. Earth is the only semi-advanced civilization that seems to employ strategy, tactics or military science to any degree.

* BigBadWannabe: Senator Robert Kinsey essentially served as this throughout the first eight seasons of the show in particular, as he sought to either shut down the Stargate program or take control of it so that he and his associates could use the alien technology discovered by the program the way ''he'' felt it should be used, regardless of whether this endangered other worlds. However, Kinsey's fundamental inability to properly understand the scale of the Goa'uld threat meant that it was always relatively easy for the SGC to demonstrate to their superiors just how screwed Earth would be if Kinsey was allowed to run the program his way.

** When Jonas Quinn was introduced he became fascinated with "traditional all-American food" and was shown eating in every episode he was in, often more than once in an episode. Carter noticed this and commented that America has another tradition, hardened arteries, and this facet of his character was dropped towards the middle of the season.

** In Season 10, SG-1 manages to "kill" all of the Ori (they're energy beings so "kill" isn't quite the right word), but [[RealityEnsues this doesn't stop their followers from continuing their war on the Milky Way]]. And to do so, they had to send the device to the Ori home galaxy, which then meant the Ori could dial into our galaxy again. They then sent several more of the vastly powerful Ori ships into the Milky Way galaxy, which effectively made things worse in the short run. [[spoiler:It also means that when Adria ascends, she now has all the power that was once split among all the Ori. This makes her insanely powerful.]]

** [[RealityEnsues A realistic depiction]]. When O'Neill is shot {{in the back}} with a silenced pistol, the vest manages to stop one of the bullets, but the other bullet hit his (non-armored) shoulder and penetrates, and the impact from the bullet that ''is'' stopped still broke a rib and knocks him unconscious.

* BecameTheirOwnAntithesis: In the novel “Relativity”, when one of the Aschen mounts a complex scheme for revenge against Earth, while she denies that her actions are based on emotion she is clearly shown taking an excess amount of pleasure in her plans against Earth, to the extent that [[spoiler:a version of Jack O’Neill from the future where she succeeded reveals that the pathogen she created basically caused the destruction of the human race because she was so eager to deploy it, and she expresses pleasure at the idea of getting to torture two versions of O'Neill]].

* DoppelgangerGetsSameSentiment: Goes back and forth in the spin-off novel “Ouroboros” when SG-1 and General O’Neill are sent to an alternate version of Atlantis (identified as such due to such details as Daniel not joining this version of the expedition due to him suffering from appendicitis before they left for Atlantis, which he had years ago in this reality). While SG-1 are willing to help the alternate Atlantis expedition, the alternate Colonel Sumner refuses to take orders from Jack as Jack technically isn’t in his chain of command (although the discovery that [[spoiler:Sumner was under the influence of the Wraith enzyme]] accounts for some of his attitude).
* DoubleCaper: In "Ripple Effect", the alternate [=SG-1=]'s plot to steal the Atlantis [=ZPM=] is quickly foiled due to the team figuring out that Mitchell would be replaced by his doppleganger when he went to speak to him. As such, despite their doppleganger's planning a trap for them when they'd inevitably escape the brig, they failed to anticipate the team being smart enough themselves and spring their own.

* EvilCannotComprehendGood: An interesting case where the villains ''think'' they understand the heroes’ motivations but fall short occurs in the novel “The Cost of Honor”, when the human inhabitants of the planet Kinahhi, having gained a foothold on Earth, tried to force Sam to cooperate with them by threatening the only other Earth native available to them. However, since the man they had captured was an associate of Senator Kinsey’s, and had contributed to Earth’s current situation with the Kinahhi basically in control of the SGC, Sam made it clear to her captors that just because they were both from Earth didn’t mean that she would care what happened to her fellow prisoner.

* FutureMeScaresMe: In the spin-off novel “Relativity”, the team discover that the current apparent attack on the SGC is led by [[spoiler:Jack’s future self from a timeline where an upcoming alliance with the space-faring Pack allowed the Aschen to mount an attack that led to the near-genocide of the human race across the whole galaxy. While Jack isn’t outright ''scared'' of his future self, he is disgusted that his other self has reverted to the ‘whatever it takes’ mentality of his old black ops days, willing to at least risk killing Sam and Teal’c in the name of stopping the Aschen]].

** After dealing with a strike force sent by the Re'tu rebels, Jacob Carter warns that they will be back. We never hear from the Re'tu again.
*** That said, the Re'tu appear in a range of spin-off novels, such as ''Kali's Wrath'' (Kali forcibly recruits SG-1 to help her negotiate with the Re'tu) and '''Relativity'' (a Re'tu is a member of a future version of the [=SGC=]).

** In the spin-off novel “Apocalypse” trilogy, SG-1 travel into an alternate future where the NID’s illegal offworld activities were never stopped, resulting in Earth being abandoned by their offworld allies and decimated by an attack from the Goa’uld. Even worse, once Atlantis rose to the surface in the Pegasus galaxy following the ZPMs being drained, the Wraith were able to take control of the city-ship with the aid of a Wraith worshipper who had the Ancient gene, resulting in the Milky Way galaxy being caught in a war between the Wraith and the Goa’uld, with a major player in this future being the Goa’uld Hestia, who has [[spoiler:taken Janet Frasier as her host and manipulated Ry’ac to act as her First Prime]].

** The spin-off novel "Relativity" looks at another Aschen-caused bad future; an attempt at revenge against the Tau'ri unleashes a pathogen that basically sterilises ninety percent of the human race across the galaxy.

* BadFuture: "2010", which initially looks like a ''good'' future. The Goa'uld have been defeated, the Jaffa liberated, and Earth is a member of the Aschen Confederacy, which has granted the planet advanced technology. However, it turns out that the Aschen are simply a much more patient alien menace, and have been [[SterilityPlague reducing human fertility]] with the plan to conquer the planet without firing a shot once the human population dies out.

** "Ripple Effect": Inverted. Among the alternate SG-1's that showed up we had at least two characters who were dead in the prime timeline: [[spoiler:Martouf, a Tok'ra operative who died in "Divide and Conquer," and Maj. Dr. Janet Fraiser, who was killed by a stray staff blast in "Heroes, Part 2."]]

* EvilLearnsOfOutsideContext: In [[Recap/StargateSG1S9E2AvalonPart2 "Avalon, Part 2"]], Daniel and Vala get their minds transported into the bodies of two people in a faraway galaxy, and inadvertently alert [[SufficientlyAdvancedAlien the Ancients' old rivals the Ori]] to the existence of human life in the Milky Way galaxy, which they wish to rule.

** The "Previously on..." opening to "The Sentinel" featured footage from "Shades of Grey" in order to re-introduce the rogue NID operation that would be important in the episode, but the two NID characters who "returned" [[RememberTheNewGuy did not actually appear in "Shades of Grey."]] They were edited into the older scenes in order to give the impression that they had been there all along.

** The first instance of time travel in season 2's 1969 showed time travel via the gate resulted in a very clear case of StableTimeLoop. However, in every other instance in [=SG-1=], as well as later series ''[[Series/StargateAtlantis Atlantis]]'' and even ''[[Series/StargateUniverse Universe,]]'' time travel will always create an AlternateTimeline.

** During Apophis' raid on earth, the earth soldiers manage to kill two jaffa, one of whom has a golden symbol on his forehead, the other of whom is a woman. The series would later use golden symbols exclusively to indicate a first prime, and make a point about jaffa culture preventing women from joining the military.

** The first instance of time travel in season 2's 1969 showed time travel via the gate resulted in a very clear case of StableTimeLoop. However in every other instance in [=SG-1=], as well as later series ''[[Series/StargateAtlantis Atlantis]]'' and even ''[[Series/StargateUniverse Universe,]]'' time travel will always create an AlternateTimeline.
** Hathor's first appearance showed a method of turning normal humans into Jaffa, in stark contrast to how later episodes would show that Jaffa are a completely different species from humans.

** Anubis at one point fires a superweapon at Abydos. He detonates the stargate itself causing a massive explosion killing everyone on the planet. It's unclear if the planet was destroyed, but it was certainly left uninhabitable.
** In "Chain Reaction", under orders from a GeneralRipper who [[TenMinuteRetirement replaces Hammond for the episode]], the SGC blows up an uninhabited planet using a naquadah-enhanced nuke to start a [[TitleDrop chain reaction]] in its naquadah veins. In theory it would have been a strategic superweapon for use against Goa'uld planets, but [[NiceJobBreakingItHero it causes the stargate to lock open temporarily due to the energy release on the far end]].

* EiffelTowerEffect: In the episode "1969", the team is travelling cross country and, at one point, the Willis Tower (formerly the Sears Tower) is shown to indicate they are in Chicago. Construction on the Sears Tower did not begin until 1971, [[TimeTravelEpisode two years after the setting of the episode.]]

* TheEmperor: The Goa'uld are divided between a number of {{Evil Overlord}}s with [[AGodAmI claims to godhood]], but several aspire to control over the entire Goa'uld domain. Ra of the first movie was retconned to have been a symbolic Emperor who maintained the fiction of unity, with subsequent infighting breaking out among the other System Lords [[EvilPowerVacuum over his succession]]. Several come close, but Ba'al is the only one to outright claim to be the "Sovereign of the Goa'uld Domain" in his near-victory.\\\
Significantly expanded in the supplemental materials. Ra, Apophis, and several other old System Lords including Sokar and Yu were the survivors of a gruesome civil war among the older System Lords after the rise of the mad Lord Anubis, who betrayed the previous leader of the Goa'uld. That earlier leader, Apep, was the son of the original discoverer of the Gate network, Atok, and had led the System Lords for thousands of years. Ra and his allies drove out Anubis, Yu attempted to murder him, and the survivors of the war put Ra on his grandfather's throne since he was the best at logistics, and could hold the Empire together in the face of alien incursions, Unas rebellions, and so forth. He took the title Supreme System Lord, and allowed some humans to enter his priesthood and army, to help maintain the numbers he would need to lead the fractious and quarrelsome Goa'uld in the face of Asgard reprisal.

* DisabilityImmunity: The SGC's stargate control system is, relative to the Dial Home Devices that pretty much every other gate is connected to, a primitive kludged-together system that effectively automates what would be a manual dial-out. Their blithe tinkering and ignoring of unknown error feedback from their Stargate has nearly resulted in the destruction of a star system due to accidental intersection of an outgoing wormhole and a star. However, the lack of a DHD means that the SGC's stargate was immune to Ba'al's DHD virus that hijacked the stellar drift correction protocols to throw all DHD addressing out of whack. During the crisis, the SGC's gate was effectively the only one that could dial out in the entire galaxy without the laborious process of a fully manual dialing.

* DisabilityImmunity: The SGC's stargate control system is, relative to the Dial Home Devices that pretty much every other gate is connected to, a primitive kludged-together system. Their blithe tinkering has nearly resulted in the destruction of a star system due to accidental intersection of an outgoing wormhole and a star. However, the lack of a DHD means that the SGC's stargate was immune to Ba'al's DHD virus that hijacked the stellar drift correction protocols to throw all DHD addressing out of whack. During the crisis, the SGC's gate was effectively the only one that could dial out in the entire galaxy without the laborious process of a fully manual dialing.

'''Teal'c''': You received permission for me to fire my staff weapon in the gate room?\\

'''Carter''': Oh, yeah.\\
'''Daniel''': Absolutely.

* BlatantLies: In "Disclosure", courtesy of the Chinese ambassador.
-->'''Ambassador:''' The Chinese government does not believe in keeping secrets from its people.

* ClipShow: Done multiple times. Except for Season 8's "Citizen Joe", each clip show advanced the plot of the series, sometimes [[NothingIsTheSameAnymore radically]], usually by framing the clips as the Stargate Program being introduced and explained to people who had previously not known its details. This format was used to reveal the Stargate program to the United Nations Security Council in Season 6 and a new incoming United States President in Season 7. And, like everything else on the show, it was utterly parodied in "200".