%% ZeroContextExample entries are not allowed on wiki pages. All such entries have been commented out. Add context to the entries before uncommenting them.
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This page is a listing of characters in ''Series/StargateSG1''.

Characters are shown with the rank they held at the end of ''Series/StargateUniverse''.

See also the character sheets for ''Characters/StargateAtlantis'' and ''Characters/StargateUniverse''.

'''Warning: Major Spoilers Ahead!'''

----

[[foldercontrol]]

!SG-1

[[folder:Lieutenant General Jack O'Neill]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Neill_5986.JPG]]
->'''Played By''': Richard Dean Anderson

The leader of the original SG-1 team. Gradually went from the tough, no-nonsense portrayal pioneered by Creator/KurtRussell in the movie to a more light-hearted and [[DeadpanSnarker sarcastic]] character that RDA was more accustomed to playing. Had zero tolerance for {{Technobabble}}. As of ''Series/StargateUniverse'', he is a three-star general.

!!Tropes:

* AcePilot: He can fly ''anything''.
* ActionHero: With just a dash of GuileHero.
* BewareTheSillyOnes: Despite his general goofball persona, it's worth remembering that he ''did'' partake in countless Black Ops missions during the 80's and is not afraid to get his hands dirty, if it means saving lives.
* BigGood: As of ''Universe'', now-Lieutenant General O'Neill is in command of Homeworld Security, and thus is basically responsible for and in command of everything that happens off-world.
* BookDumb: It's implied that he's actually a lot smarter and more knowledgeable than he lets on, but [[ObfuscatingStupidity just pretends to be dumb]] in order to mess with people, leading to a stunned pause when he knew what an "accretion disk" is.
%%* BunnyEarsLawyer
* TheCameo: In ''Series/StargateUniverse'', he makes guest appearances in his capacity as head of Homeworld Security.
* TheChosenOne: The Asgard view Jack as this, having not only survived his encounter with an Ancient Repository, but actually managed to figure out how to dial the Stargate to reach another ''Galaxy'' so he could ask for their help. It's later revealed they named an entire class of Asgard vessels after him.
* ChosenConceptionPartner: In "A Hundred Days", he falls in love with a native woman on the planet he's shipwrecked on. The night before he's to be rescued, she asks him to leave her with a child. We're never told if the task was fulfilled.
* TheCombatPragmatist: Though O'Neill shows plenty of restraint, he doesn't play around when he needs to start killing. In the first season, for example, he has no compunctions with sneak-attacking a Jaffa soldier, throwing him to the ground, and cutting his throat.
* ChronicHeroSyndrome: If Jack encounters a serious danger to the local population on the other end of a Stargate, he ''will'' intervene, without hesitation. This tendency has led to more than one very fortunate alliance with another species or human society, and conversely several sticky situation when all was not as it seemed.
* ColonelBadass, later promoted to [[FourStarBadass Three-Star Badass]]. The ColonelBadass is so iconic that he goes back to Colonel in alternate timelines.
* DeadpanSnarker: So much so that when a doppelganger starts aping him with deadpan, emotionless tones, no one thinks this is strange at first.
%%* FourTemperamentEnsemble: Choleric
* FriendlySniper: During the attack on the Goa'uld POWCamp in "Orpheus," Jack uses a sniper rifle rather than his usual P90, and to great effect.
%%* GoingNative: "A Hundred Days."
* GoodIsNotNice: Some fans were upset how he was portrayed in ''Universe'', being willing to do ''anything'' to safeguard Earth... seemingly forgetting that Jack freely admits he spent most of the 1980's performing ''black-ops''.
* GrammarNazi: He '''''will''''' correct someone who uses "who" in place of "whom."
* HeManWomanHater: Averted. In "Children of the Gods" when Carter suspects this is the reason he objected to having her on his team, he reveals that it's not because she's a woman, its because he doesn't like ''[[DiscriminateAndSwitch scientists]]''.
%%* HurricaneOfEuphemisms
%%* InvisibleMainCharacter: Spoofed in "200."
* JerkassFacade: Can put a up a truly ''nasty'' one when he feels like it. Has been incredibly cruel to just about every major character, usually in service of some ulterior goal. Otherwise a NiceGuy, unless his pet peeves have been pushed.
* JerkJock: Mostly a mellowed version, however he still shows occasional disdain towards scientists, Carter and Daniel being major, obvious examples. He does develop genuine respect for them though, to the point of developing [[OddFriendship Odd Friendships]] with them both. He goes so far to describe Carter as "A natural resource, if not a national treasure".
* TheLeader: A type II. He always has a cool head.
* TheMcCoy: Bases his decisions on emotions rather than rules or reason. One time he wanted to bring an extra SG team to a planet that was conducting a murder trial for Teal'c. His {{plan}} was to show off his BiggerStick and hope they surrendered. His motivation was saving a teammate and he was willing to violate every law on that planet (and several on his own) to make it happen.
* ManChild: He sometimes acts like this when he is relaxed and off-duty.
* {{Metaphorgotten}}: Occasionally wanders off into this trope. May be part of his ObfuscatingStupidity routine.
* MyGreatestFailure: Jack is still haunted by the fact that his son Charlie found Jack's service weapon in their home and accidentally fatally shot himself with it. Jack's marriage ended as a result soon after. Several episodes of the series deal with the guilt Jack still feels.
* MilitaryMaverick: Doesn't have much respect for rules despite TheChainsOfCommanding.
* TheNicknamer: Often comes up with less flattering names for the enemies he's facing. In particular, he often refers to the Goa'uld as snake-heads and Replicators as bugs.
* ObfuscatingStupidity: Several characters mention that O'Neill is much more intelligent than he pretends to be; he's just very military in his thinking and would like to be told that yes, this thing ''will'' do what he thinks it will rather than someone giving him a lengthy {{Technobabble}} explanation on ''why'' it will do what he thinks it will. Given his interest in astronomy, he occasionally surprises people with his knowledge of it.
* OnlyKnownByTheirNickname: His full name is Jonathan J. O'Neill.
* ParentalSubstitute: Surrogate uncle to Skaara.
* PrepositionsAreNotToEndSentencesWith:
-->"You ended that sentence with a '''preposition'''! ''Bastard!''"
* PutOnABus: Season eight saw his role on the show much reduced by his promotion to Brigadier General, due to RDA wanting to spend more time with his family. He was soon transferred to the Pentagon to head Homeworld Security.
* RankUp: Promoted twice during ''SG-1'', then again between ''Atlantis'' and ''Universe''.
* TurnInYourBadge: Subverted. [[spoiler: It was a ReverseMole role he played as part of a sting operation against a rogue element that had infiltrated the SGC.]]
* UltimateJobSecurity: He's broken enough rules and caused enough trouble to get himself court-martialed every day of the week but he keeps his rank and his post. Probably something to do with the extremely secret nature of the SGC and the fact that no one else, with the exception of Teal'c and the other members of SG-1, has anything like his level of experience. Most of said violations tended to occur as a result of him following his instincts, rather than protocol, and he was pretty much always proven right. Richard Dean Anderson once asked the Air Force Chief of Staff (who was guest-starring AsHimself on the show) if he'd met officers as bad as Jack. [[RealityIsUnrealistic "Worse,"]] was the reply.
* UnresolvedSexualTension: By the bucketful with Samantha Carter.
* TheWatson: He's the one asking Daniel "What are those people doing" or asking Sam "What's that thing do" so they have an opportunity to explain.
[[/folder]]

[[folder:Dr. Daniel Jackson]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Daniel_Jackson_2626.jpg]]
->'''Played By''': Michael Shanks

TheLancer crossed with TheSmartGuy and another character from the movie, where he was played by James Spader. The team archaeologist and linguist. The latter aspect wasn't of much use in the series when it turned out that [[AliensSpeakingEnglish all the aliens spoke English]], but he found his use in translating written text and providing exposition about ancient artifacts or mythology. He is an idealist and pacifist -- in Seasons 4-5, often to the point of being a Messiah -- and prefers to resolve conflicts via diplomacy rather than force of arms, often clashing with O'Neill as a result. Has a habit of repeatedly dying and coming BackFromTheDead thanks to AppliedPhlebotinum or intervention of SufficientlyAdvancedAliens. In fact, when Michael Shanks decided to leave and later reconsidered, he stayed dead (and [[AscendToAHigherPlaneOfExistence ascended]]) for an entire season.

!!Tropes:

* AndStarring: Starting with season 7, he appeared in the opening under "And Michael Shanks as Daniel Jackson."
* AscendToAHigherPlaneOfExistence: So nice, he did it twice.
* AdventurerArchaeologist: This is ''his'' opinion of what the Earth Stargate should be used for.
* BackFromTheDead: So many times it's become a RunningGag.
-->"Dr. Jackson's gonna ''die'' when he sees this!"
-->"What, ''again''?
* BadassBookworm: Well, as close to {{Badass}} as he could possibly get being a squishy civilian scientist. He has undoubtedly become one at about season seven.
* BewareTheNiceOnes: After he stops [[TookALevelInBadass taking crap from people.]]
* TheCameo: The ''Series/StargateUniverse'' pilot had Eli learn about the Stargate Program by watching [=DVDs=] hosted by Daniel.
%%* CunningLinguist
* DeadpanSnarker: He picks this up in later seasons due to exposure to O'Neill.
* TheFace: He's the team diplomat and the one putting the polite and peaceful foot forward in negotiations.
* {{Foil}}: Clashes with O'Neill about how to handle conflict.
%%* FourTemperamentEnsemble: Melancholic
* TheHeart: Most of SG-1's TearJerker scenes had Daniel as their focus.
* HeroicSacrifice: But he kept coming back.
* HeWhoFightsMonsters: It's hinted more than once that Daniel has a dark side and that Bad Stuff would happen if he succumbed to it.
* LikeAnOldMarriedCouple: Practically most of his interaction with Vala.
* LoopholeAbuse: Daniel has more than once avoided punishment for ignoring orders or actions that would land any normal soldier with a serious court martial. Somewhat justified as he's still technically classified as a civilian, thus he's not strictly bound to the military hierarchy.
* MartialPacifist: Daniel really does ''not'' like violence, and greatly prefers trying to talk to the opposition, instead of shooting them. In the event that he ''is'' [[LetsGetDangerous provoked into combat]] however, his ferocity towards the enemy will be driven by anger, due to the fact that they managed to push him into it.
* MeaningfulName: Possibly accidental, but as mentioned in "Upgrades", "Daniel" means "God is my judge" in Hebrew. Think about that for a minute.
** Further, in TheBible, Daniel was a prophet who was able to read [[http://en.wikipedia.org/wiki/The_writing_on_the_wall The writing on the wall]], which prophesied the downfall of the Kingdom of Babylon, as punishment for members of the court committing blasphemy. Whether intentional or not, [[{{Applicability}} it fits very nicely.]]
* MessiahCreep: This aspect seems to have diminished starting with Season 7, mostly because the Ancients were revealed to have been incredibly NeglectfulPrecursors and less worthy of his idolation. The reason the Ascended Ancients kicked him out was because he was too much a MessianicArchetype, not wishing to sit idle while he had the power to actively help people, which was against their rules.
* MinoredInAsskicking: Several members of other SG teams under the protection of SG-1 have joked about how comforting it is to know that an archaeologist has their backs. Once the shooting starts though, they realize rather quickly that Daniel can kick just as much ass as the rest of the team.
* MrExposition: This is the guy talking about ancient Babylon or future world or whatever.
* MotorMouth: He can speak ''very'' quickly when he wants to. Doesn't come up often, though.
%%* MrFanservice
%%* NerdsAreSexy
%%* NiceGuy
* {{Omniglot}}: Speaks twenty-three languages as of "1969" an episode in the second season. After that he learns to speak at least Unas and Alteran Ancient. On screen he has shown proficiency with the following languages: English/Middle English (related), Latin/Alteran (related), Arabic, German, Mandarin Chinese, Russian, Greek, Mayan, Aztec, Norse/Asgard (related), Welsh, Spanish, Phoenician, Egyptian/Abydonian (related), Goa'uld/Unas (assumed related) and a form of Goa'uld that uses Linear A, Ancient Babylonian (in cuneiform), Ancient Celtic. It is likely but unconfirmed that he can read Tollan.
* ParentalAbandonment: He was orphaned at a young age when his parents were killed in a museum accident, which he witnessed. Double dose when his famous archeologist grandfather didn't take him in since he was too busy traipsing around the world.
* PopculturalOsmosisFailure: When Mitchell makes a reference to DieHard in one episode, it goes right over Daniel's head. Amusingly, Teal'c explains it to him.
* ScienceHero: Well, Archaeologist/Linguist/Egyptologist hero, really, but science is close enough. He's usually the guy who's most likely to understand Carter's TechnoBabble.
* TheSmartGuy: An archeologist/anthropologist/linguist on a team of soldiers
%%* StoicSpectacles
* TastesLikeFriendship: Uses this trope so much, some call it "The Daniel Jackson Method."
* TheyKilledKennyAgain: Depending on whether or not you count androids, alternate realities, and virtual reality simulations, he's died over 20 times. Even disallowing every single time he [[DeathFakedForYou didn't actually die]], he still dies at least four times. After the second time he died (ironically, one of the times he wasn't really dead), the rest of the cast basically gave up on even giving him a funeral. Eventually it did become a RunningGag that some of the other characters ([[DeadpanSnarker Jack]]) just stopped buying it.
%%* ThroughTheEyesOfMadness
* TookALevelInBadass: Starts out a squishy scientist and becomes more formidable than soldiers. Lampshaded in an episode not longer after he ascends. Hammond wants O'Neill to choose a new member of SG-1, and O'Neill complains that all of his choices have two left feet. Hammond points out that O'Neill used to say the same thing about Daniel.
* {{Troll}}: The scene in "Heroes" where he leads Emmett Bregman's documentary crew on a merry chase through the SGC just to pick up a fax.
--> '''Bregman:''' What is the, uh…what is the significance of that?\\
'''Daniel:''' It's fascinating.\\
'''Bregman:''' It's fasc…Okay. ''(to his crew)'' Back up. Back up. ''(back to Daniel)'' Uh, that's it? It's "fascinating"? Then why were we running?\\
'''Dr. Jackson:''' Oh, uh, I just wanted to see if you'd chase me.
%%* {{Tsundere}}: Type B, with Vala.
* WrittenInInfirmity: Michael Shanks came down with appendicitis during the filming of "Nemesis", forcing what the scriptwriter called "the fastest rewrite in history". They chose to give Daniel appendicitis, and had him still recovering from surgery in "Small Victories" (averting HollywoodHealing in the process).
[[/folder]]

[[folder:Colonel Dr. Samantha Carter]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Samantha_Carter_9347.jpg]]
[[caption-width-right:250:Carter as of ''Series/StargateAtlantis''.]]
->'''Played By''': Creator/AmandaTapping

The token female of the team. Like Daniel Jackson, served as the voice of reason, as opposed to O'Neill's gung-ho approach to problems. As a scientist, was the source of much {{Technobabble}} and AppliedPhlebotinum, usually [[MacGyvering jury-rigged]] to solve this week's problem. Throughout the seasons, she went from "reasonably brilliant" to "genius who would be bathing in Nobel Prizes if not for the secrecy of the Stargate Program". Later promoted to full-bird Colonel and [[{{Transplant}} joined]] the [[Series/StargateAtlantis Atlantis Expedition]] after ''SG-1'' was cancelled. As of ''Series/StargateUniverse'', she has been given command of the ''Daedalus''-class battlecruiser ''George Hammond''. Appeared in more ''[[Franchise/StargateVerse Stargate]]'' episodes than any other character.

!!Tropes:

* AcePilot: Logged over a hundred hours in enemy airspace during the Gulf War.
* ActionGirl: Though normally the brains of the operation, when an asskicking is called for, Samantha is more than happy to supply it.
* BadassBookworm: ''Blew up a frakking sun.'' Also can go toe to toe with her male teammates in terms of hand-to-hand combat and shooting things with a variety of guns (some of which are bigger than she is). Did we mention she's a certified genius whose brain Jack O'Neill has described as "one of this country's natural resources, if not national treasures"?
* TheCameo: Makes appearances in ''Series/StargateUniverse'' as CO of the USS ''George Hammond''.
* CartwrightCurse: Up until Pete Shanahan, every man that she became attracted to (except O'Neill) ended up dying a violent death. Two {{alternate|Universe}} Carters that married O'Neill suffered the same fate.
* EmpoweredBadassNormal[=/=]TouchedByVorlons: Mildly. After surviving the death of Jolinar, a Tok'ra symbiote implanted itself in her in "In the Line of Duty," she gains traces of bloodborne naquadah that allow her to sense Goa'uld symbiotes and use their technology. She also gains a strong resistance to sedatives.
%%* FourTemperamentEnsemble: Sanguine
* GadgeteerGenius: They went back and forth on how strongly this was portrayed. For example she invented the first Tau'ri naquada generator in a few days based only on a partial schematic of a ''completely different'' reactor, using only materials she happened to have in her personal lab.
%%* HotScientist
%%* MacGyvering
%%* NerdsAreSexy
%%* NumberTwo
* OmnidisciplinaryScientist: Except for Jackson's fields, and anything specifically mentioned as not her specialty, like vulcanology.
%%* ParentalSubstitute: To Cassandra Fraiser.
* RankUp: She starts off as a Captain (O3 paygrade), gets promoted to Major (O4), hen gets promoted to Lieutenant Colonel (O5), and finally gets the full bird Colonel (O6) when posted as commander of the Atlantis Expedition. The defunct ''VideoGame/StargateResistance'' MMO shooter has her as a brigadier general and CO of the SGC.
* RememberWhenYouBlewUpASun: The TropeNamer, an achievement [[NeverLiveItDown she never lives down.]]
* ScienceHero: As sciencey as they come
* TheSmartGuy: Overlapping with TheLancer [[TropesAreNotBad and]] TheChick.
%%* TheSquadette
* StrawFeminist: In earlier episodes especially -- it got toned down as the show went on. In the pilot, she famously accused O'Neill of not liking her because her "reproductive organs are on the inside." (Amanda Tapping says she later explained to the writers, "Okay, women don't talk like that.") When they re-released the pilot on DVD, they edited that conversation out. And mocked in "Moebius" when Alt!Carter practices an argument, then chastises herself for even contemplating to say something so stupid. And again in the marionette sequence in "200".
* {{Transplant}}: To ''[[Series/StargateAtlantis Atlantis]]'', partly as a result of having a year left in her contract when ''SG-1'' was cancelled.
%%* TrickDialogue: Alternate Carter in "Moebius."
* UnresolvedSexualTension: By the bucketful with Jack O'Neill.
[[/folder]]

[[folder:Teal'c]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Tealc_9522.jpg]]
->'''Played By''': Christopher Judge

Originally First Prime of Apophis, he defected to the [[HumansByAnyOtherName Tau'ri]] after becoming [[DefectorFromDecadence disillusioned]] with the Goa'uld. He probably underwent the most CharacterDevelopment in the entire show, with Daniel as a close second: he gradually assimilated into the Earth culture, as well as developed complex emotions. About the only thing that remains by now of his original SpockSpeak is his CatchPhrase, "Indeed."

!!Tropes:

* AffectionateNickname: Vala frequently refers to Teal'c simply as "Muscles".
* TheAtoner: Goes all the way back to season 1. He was prepared to let the natives of one world execute him after a KangarooCourt because he felt he really did deserve it for his actions prior to turning against Apophis.
--> '''Teal'c''': While in the service of Apophis I did many things. For these deeds my victims deserve retribution.
--> '''O'Neill''': Can we focus on this one case only for now, please?
--> '''Teal'c''': This case represents the many.
--> '''O'Neill''': Well it shouldn't!
--> (later)
--> '''Teal'c''': Hanno's father was not the first or the last of those whose lives I have taken. And I have done far worse, O'Neill. I can not give all of their loved ones retribution, but I can at least give it to this one.
%%* {{Badass}}
* BadassBaritone: Easily the character with the deepest voice outside of the Goa'uld.
* BadassBeard: Sports a small goatee for a few Season 4 episodes.
* BadassLongcoat: In "200", he imagines himself as a badass private eye with an awesome longcoat. He kicks one of his clients out through his office's front door for disagreeing with him.
* BaldOfAwesome: Until Season 8 his head was clean shaven, although he sometimes had a goatee.
* TheBigGuy: Easily the physically strongest member of [=SG1=] on account of being a Jaffa instead of a human. This most frequently finds use whenever the team needs to dial the gate manually.
%%* BluntMetaphorsTrauma
%%* BrutalHonesty
* {{Catchphrase}}: "Indeed."
* ClosetGeek: Surprisingly enough. His favourite films are ''Franchise/StarWars'' and ''Old School''.
* CunningLinguist: Before Daniel caught up Teal'c was the only member of [=SG1=] who could read Goa'uld and several of their obscure scripts.
* CursedWithAwesome: His Goa'uld symbiote is a rite of passage among his people and endows him with a HealingFactor and immunity to diseases. He hates it.
%%* DefectorFromDecadence
* TheDeterminator:
** The biggest example is in ''Awesome/TheArkOfTruth''. He hikes across an entire ''mountain range'' to get to Celestis, where his friends are being held captive, after having been ''shot in the back''.
** Unfortunately used against him in "Avatar", where the [[LotusEaterMachine computer simulation]] analyses his stubborn determination and subconscious fears that the Goa'uld might never be defeated, leading him to get trapped inside an UnwinnableTrainingSimulation, which only increases with difficulty [[HarderThanHard each time it resets]].
%%* FishOutOfWater
%%* FourTemperamentEnsemble: Phlegmatic
* GunsAkimbo: Starting in season 9 with P-90's, of all things--presumably he got bored with his signature staff weapon. Justified in that he used the Staff Weapon up until the fall of the Goa'uld in Season 8, presumably as a TakeThat using their own weapons against them. Also, it was a weapon designed for intimidation over killing power.
* KlingonsLoveShakespeare: He's quite a movie buff, as he's [[SawStarWarsTwentySevenTimes seen Star Wars 9 times]], and is familiar enough with DieHard to catch reference to the main character.
* LoopholeAbuse: Like Daniel, Teal'c has avoided punishment for ignoring orders since he's not technically part of the military. Amusingly played with in "Upgrades", when Jack notes that Teal'c can't be punished for this reason, which Hammond acknowledges and points out that not only that, he actually ''did'' follow orders by not embarking on the unauthorised mission with the rest of [=SG-1=], only following them because Hammond ordered him to retrieve them.
* MeaningfulName: "Teal'c" means "strength" in Goa'uld.
* MookFaceTurn: He was Apophis' First Prime before turning on his subordinates.
* NiceHat: Wears a variety of chapeaux whenever he has to go in public, including a fishing hat, fedora, cowboy hat, a fake afro and a headband.
* NotSoStoic: Teal'c displays true emotion rarely, which makes those moments where he does exhibit rage, fear, or sorrow all the more poignant.
%%* ProudWarriorRaceGuy
* TheQuietOne: Doesn't talk much.
* ReallySevenHundredYearsOld: In the season four episode "The Light", Teal'c is stated to be 101 years old. By series end, he's over 150. (TimeDilation was involved.)
* SawStarWarsTwentySevenTimes: ''Franchise/StarWars'' is his favorite movie, apparently. He's seen it so often that the first example that springs to his mind with "virgin birth" is Darth Vader, not Jesus.
%%* ScarilyCompetentTracker
* ScaryBlackMan: He's more than willing to use it to his advantage and is the best interrogator in the SGC. All he does is walk into the room, and glare the informant until he gets the information he wants. Lampshaded in the episode "Prisoners", where O'Neill orders him to "look scary and take point".
* SkunkStripe: His long lifespan meant that Teal'c more or less stayed that same while his friends grew old in "Unending." Fortunately, when an aged Carter finally discovered a way to save everyone, Teal'c's unmarred strength allowed him to complete the mission and return to the present. The only clue to his true age is a glaring stripe of white hair.
%%* TheSpock: Originally.
* TheStoic: Takes some surprisingly uncomplicated moral positions. Like feeling no guilt at killing an alternative universe version of himself because 'Ours is the only reality of consequence' and that Teal'c still believed the Goa'uld were gods.
* TakingYouWithMe: In ''Continuum'', as he lays dying from a staff blast with Qetesh standing over him gloating, he reveals a live grenade in his hand. Cue OhCrap look from Qetesh before the whole room gets blasted apart.
* TokenHeroicOrc: He's a Jaffa, i.e. the mooks SG-1 fights whenever the Goa'uld show up. He's there to prove they're not all bad.
%%* WarriorPoet
* YouCantGoHomeAgain: Because you are a traitor and your family is shunned even by other outcasts. This [[EarnYourHappyEnding wore off after Apophis was killed]], after which he stays on Earth by choice.
[[/folder]]

[[folder:Jonas Quinn]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Jonas_Quinn_9520.jpg]]
->'''Played By''': Corin Nemec

An alien, with a name inexplicably sounding less alien than that of his actor. Replaced Daniel Jackson for season 6, then unceremoniously written out when Michael Shanks changed his mind. He was essentially the geek figure that Daniel ceased to be by that point, but in many ways was different from his predecessor, as his primary motivation was atonement for what he saw as his fault -- that is, Daniel's death. [[WhatHappenedToTheMouse His fate following the Ori conquest of his homeworld Langara is unknown.]]

!!Tropes:

%%* {{Adorkable}}
* TheAtoner: Dr. Frasier once lampshaded the fact that while serving at the SGC he constantly showed a capacity for near suicidal self sacrifice, stemming from his feelings of guilt over Daniel's HeroicSacrifice in order to save his planet.
* ChronicHeroSyndrome: Sometimes overly eager to put his life in danger to help the team.
%%* CunningLinguist
%%* HumanAlien
%%* InstantExpert: See PhotographicMemory below.
* {{Keet}}: Tended to get excited by just about everything.
* LovableNerd: More so than Daniel do to his ''[[{{Keet}} peppiness]]''.
%%* NiceGuy
* OnlySaneMan: Compared to the other Langarans.
* PerpetualSmiler: And O'Neill just loves to lampshade it.
* PhotographicMemory: Apparently a trait of the Langarans.
%%* SuspiciouslySimilarSubstitute: Former {{Trope Namer|s}}.
* WhatHappenedToTheMouse: After Series 7 we hear no word from him, leading some to speculate he died during the Ori invasion of Langara. Was a throwaway line on ''Universe'' when they actually show Langara again, too much to ask?
[[/folder]]

[[folder:Lieutenant Colonel Cameron "Shaft" Mitchell]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Cameron_Mitchell_3056.jpg]]
->'''Played By''': Ben Browder

Replaced O'Neill as the leader of SG-1 for Seasons 9-10, which received the FanNickname "Fargate" (or sometimes "Starscape") due to the fact that he and Creator/ClaudiaBlack were former ''Series/{{Farscape}}'' leads. He wasn't, however, a straight O'Neill clone; while still a wisecracking action guy, he didn't have his predecessor's tendency to disobey orders. Also notable in that his "leadership" of the team was at best just in theory; he was the rookie (even compared to Vala, who had more experience) and didn't actually outrank any of his team.

!!Tropes:

* BadassNormal: He doesn't have the Ancient Gene, he's not an alien {{Badass}}, he's just a normal earthling. He still kicks plenty of ass.
%%* BewareTheNiceOnes
* BigDamnHeroes: He led the fighter squadron that saved SG-1 in Season 7, and personally saved them at one point.
* ButtMonkey: Intentionally done by the writers, they envisioned him as someone who would get his "ass whupped a lot".
* ColonelBadass: Thanks to some training with the Sodan.
%%* DayInTheLimelight: A few.
* DeadpanSnarker: If you're going to fill O'Neill's shoes, the "skill" of deadpanning is a must.
%%* TheHero
* HeroWorshipper: Big fan of all the original SG-1 team members.
%%* HeroicSpirit: Got it in spades.
* ImprobableAge: He is the bare minimum age for his rank, requiring him to be promoted as soon as legally possible to reach it at his age.
* MyGreatestFailure: He once bombed a convoy, after asking for and receiving confirmation that it contained the target. ''Immediately'' after he released the bomb, he was told to hold his fire. The convoy was destroyed, and it turned out to be carrying refugees. He was considered blameless, but it haunted him for the rest of his life; and he almost resigned over it.
* NomDeGuerre: As an F-302 pilot, had the callsign "Shaft" (short for "camshaft", a mechanical part that shares part of his name).
%%* PuttingTheBandBackTogether: Invoked.
* SouthernFriedPrivate: Technically, he's from Kansas, but his family moved from Tennessee and still made trips there to visit his grandma. Also, he has a slight Southern accent.
* SuspiciouslySimilarSubstitute: Averted. The writers knew they could never replace O'Neill, so they made a concerted effort to make him a unique character.
* YouAreInCommandNow: And a few must have been field promotions as well as right on time.
[[/folder]]

[[folder:Vala Mal Doran]]
[[quoteright:238:http://static.tvtropes.org/pmwiki/pub/images/Vala_Mal_Doran_4837.jpg]]
->'''Played By''': Creator/ClaudiaBlack

A genuinely new addition to SG-1 rather than a replacement, although she only officially joined the team in season 10, when SG-1 received a fifth member for the first time in its history.

About the only two things known for certain about her backstory[[note]]it changes practically every time she opens her mouth[[/note]] are that her father is a rather useless con artist, and that for a relatively short time she was the host of the System Lord Qetesh, the Goa'uld impersonating the Egyptian goddess of sex. The Tok'ra removed Qetesh and Vala became a black market trader and con artist in the criminal underworld of the slowly collapsing Goa'uld Empire.

She first met up with SG-1 when she hijacked the USS ''Prometheus'' in "Prometheus Unbound" and joined the recurring cast in season 9 before being thrown into the Ori galaxy and used as [[Literature/TheFourGospels the "virgin" Mary]] for their DarkMessiah, Adria. Once retrieved, she joined SG-1.

!!Tropes:

* BelligerentSexualTension: Pretty much sums up all of her interaction with Daniel.
%%* ChainedHeat
%%* ConMan: Well, woman.
* DarkAndTroubledPast: She was a host to the Goa'uld Qetesh.
* DisappearedDad: General Landry, who is divorced, tries to draw a parallel between his own failures as a husband and father and Vala's father's issues. Vala points out that Landry, as a military officer, had a legitimate excuse, whereas her dad is a ConMan, and not even a particularly successful one.
* FunPersonified: She's like this a lot... [[spoiler:to hide her [[BrokenBird angst]]]].
%%* TheGadfly
%%* GenkiGirl
* GirlishPigtails: She even sported them in her [[WizardOfOz Dorothy]] look!
* {{Greed}}: Her FatalFlaw.
* GroinAttack: One of her specialties.
%%* JerkWithAHeartOfGold
* LikeAnOldMarriedCouple: Most of her interaction with Daniel.
%%* MeetCute
* MsFanservice: Although there's not a lot of it about in this series, Vala clearly qualifies via some of her outfits.
%%* TheNicknamer: On occasion.
* NoodleIncident: Her entire backstory seems to be one long NoodleIncident.
* NoYay: Invoked often towards Ba'al, who is fond of expressing his attraction towards both her and Qetesh, the Goa'uld who formerly inhabited her.
* PirateGirl: Her first appearance in particular, where she steals the ''Prometheus''.
* SixthRanger: [[LampshadeHanging Lampshaded]] by the title sequence after her official inclusion in SG-1. As the four other members of the team prepare to step through the gate, Vala is shown running in to catch up with them.
%%* StepfordSmiler: Type A
* ThatThingIsNotMyChild: She does not view Adria as her daughter, which she proves once and for all in "Dominion" when [[spoiler:she tries to machine-gun her to stop her from ascending]].
%%* {{Troll}}: Frequently indulges in this.
* VaporWear: She appears not to have been wearing anything under a Kull Warrior suit in her first appearance. She's shown in a form fitting jumpsuit when she removes the armour, but that might have been part of the undersuit.
* WrittenInInfirmity: Vala's pregnancy with Adria was due to Claudia Black's own.
[[/folder]]

!Other Members of the SGC

[[folder:Major General George Hammond]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/George_Hammond_2452.jpg]]
->'''Played By''': Don S. Davis

Original leader of Stargate Command. Was a BaitAndSwitchTyrant in the first episode, but eventually became a ReasonableAuthorityFigure who trusted the vast majority of ideas and pitches from our heroes based on their track record, no matter how outlandish. The change was signified when he stopped regularly wearing his USAF uniform in favor of a simple blue shirt with a tie, a dress code that was later followed by his eventual successor, General Landry. Was referred to as "Hammond of Texas" by Teal'c's {{Mentor}}, Bra'tac. Was relieved of command in favor of Elizabeth Weir for the duration of the PoorlyDisguisedPilot for ''Series/StargateAtlantis'', who was in turn soon replaced by Jack O'Neill.

!!Tropes:

* BadassGrandpa: He has grandchildren and, when he goes into the field, he is badass.
* BaitAndSwitchTyrant: One of his first acts was to try to blow up an inhabited planet. It wasn't long before he was downright fluffy, though. Hammond was counting down the days to his retirement in charge of a facility gathering dust, when the Gate suddenly reactivated. His actions and decisions throughout most of the first and second series are more or less the result of being just as out of his depth as everyone else, before he eventually [[TookALevelInBadass rose to the challenge]].
%%* BaldOfAwesome
* BenevolentBoss: Looks out for the people under his command (even the guests in his facility).
%%* BigDamnHeroes: "Lost City."
* CatchPhrase: "Godspeed" and "You have a go."
* TheChainsOfCommanding: His more malicious acts (like the above mentioned planet bombing) were because he had orders and unlike Jack "I follow my orders."
* CommutingOnABus: Starting in season 8 he's given a third star and transferred to the Pentagon to head Homeworld Security. He makes a couple of appearances after that.
* DaChief: General in command of Stargate Command and the ones the heroes answer to. Sitting behind a desk and saying "YouHave48Hours" is mostly his role. Unusual for the role he doesn't worry about backlash from the President if he tweaks the rules.
* AFatherToHisMen: Often acts this in spades towards SG-1. "As long as there is a snowball's chance in hell of my officer coming out of this alive we're going to take it!" He even addresses Kawalsky as 'son'.
** In "Prisoners", he nearly gets ''himself'' imprisoned after he loses his temper at the Taldor for unjustly imprisoning SG-1, likewise, taking his first trip through the Gate to personally negotiate their release.
** He reveals to Jack that he has his grandkids listed on his autodialer ''above'' the President.
** Lord knows what would have happened in "Chain Reaction" if he had been able to deploy the military forces under his command within the United States.
%%* LineInTheSand: "Into the Fire."
* RankUp: Spent season 8 as the lieutenant general in charge of Homeworld Security, then retired.
* ReasonableAuthorityFigure. George "You Have A Go" Hammond very rarely turns down requests from his team and when he does it's for very good reasons. Later in the series, he immediately believes an outlandish scenario told to him by Daniel, who is himself stunned he believes him. Hammond's answer? "The things I've heard sitting in this chair!".
%%* TenMinuteRetirement: "Chain Reaction."
* TimeTravelForFunAndProfit: Forms a BrickJoke in "1969", when Jack borrows some money for his younger self, promising to pay him back with interest. After they return to the present, Hammond informs him that it's now up to $539.50, with interest.
[[/folder]]

[[folder:Major Dr. Janet Fraiser]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Janet_Fraiser_9966.jpg]]
->'''Played By''': Teryl Rothery

For some reason, never appeared in the opening credits despite effectively being a regular. The SGC's medical officer, she often saved SGC members and aliens from the brink of death. She was a nurturing, motherly figure, best expressed when she adopted the alien girl Cassandra. Became Samantha Carter's best friend. [[DroppedABridgeOnHim Had a bridge dropped on her]] in the season 7 two-parter "Heroes." She was eventually succeeded by Dr. Carolyn Lam in Season 9.

!!Tropes:

* ActionMom: When she's seen offworld, she's generally pretty action-y. Even a few times on Earth. After she [[PromotedToParent adopts]] Cassandra, the mom part of Action Mom comes into play and completes this trope.
* DamselOutOfDistress : Even when she's held at gun point, it's not a good idea to piss her off.
* [[DeadGuyJunior Dead Girl, Junior]]: Janet Wells, the daughter of the would-be RedShirt whose life she saved in "Heroes."
* FieryRedhead: Most of the time, she's a really nice person, but trying to hurt someone she cares about ... may be the last thing you ever do.
* HonoraryTrueCompanion: For SG-1 and Sam in particular.
%%* HospitalHottie
%%* TheMedic
%%* MajorlyAwesome
* MamaBear: At one point, She takes Nirrti hostage and demands that she fix Cassandra. Nirrti was still unwilling to help at first, even with the gun to her head. Then Hammond informed her that Fraiser was Cassandra's mother. Nirrti got a lot more cooperative after that.
* RankUp: Went unremarked, but at some point around season four her rank insignia changed from the double-bar of a captain to the brass leaf of a major.
* SenselessSacrifice: How many viewed her death, especially some rat-faced politicians. She saved the man she was treating, who later admits to having some SurvivorsGuilt, feeling that he wasn't worth losing her over. He's chosen to honour her sacrifice by [[DeadGuyJunior naming his unborn daughter after her]].
%%* TeamMom
[[/folder]]

[[folder:Chief Master Sergeant Walter Harriman]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Walter_Harriman_6870.jpg]]
->'''Played By''': Gary Jones

AKA Chevron Guy, sat at the computers and called out when the chevrons were locked. Didn't get fleshed out much until a few seasons in. Eventually became O'Neill's assistant when he took over for Hammond as General.

!!Tropes:

* AscendedExtra: From season 8 onward.
* TheCameo: [[DemotedToExtra Demoted Back to Extra]] in ''Series/StargateUniverse'', where he makes brief appearances with O'Neill (and has gone bald on top).
%%* EngagingChevrons: [[invoked]] TropeNamer.
%%* LovableNerd
%%* HypercompetentSidekick
* IHaveManyNames: The show simply couldn't decide what his name was. The Stargate wiki went with "Norman Walter Davis Harriman".
* NiceGuy: Both on and off the clock.
* PluckyComicRelief: When he's on screen for more than a split second.
* SeriousBusiness: Takes his job (calling out the chevron encoding) ''very'' seriously.
* ShoutOut: to Corporal [[Series/{{Mash}} Walter "Radar" O'Reilly]], in name, role, and ability to anticipate needs or orders
* SpiderSense: Always knows what O'Neill and Landry want before any announcement over the PA is made.
-->'''Walter''': You have to push the button to talk, sir.
-->'''Landry''': ''Sigh''... Thank you, Walter.
* WhatExactlyIsHisJob: His precise job at the SGC is a mystery for most of the series, but is finally answered in the Series 7 episode, "Heroes Part 1 & 2". Turns out that besides EngagingChevrons, he's also responsible for [[PortalSplat closing the Iris]] to prevent any unknown inbound travellers... and ''that's it!'' In season 8 he gains the additional job of aide to General O'Neill. In the alternate BadFuture of "2010", we see Walter still working in the SGC, now having been converted into a museum. Of course, it's entirely possible that he simply [[OldRetainer came with the place]] when they bought it.

[[/folder]]

[[folder:Major General Hank Landry]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Hank_Landry_9693.JPG]]
->'''Played By''': Beau Bridges

Replaced O'Neill in Season 9 as the commander of the SGC, but was actually closer to Hammond in both appearance and command style.

!!Tropes:

* AndStarring: Beau Bridges was prefixed with "With" in the opening.
* BenevolentBoss: He's a reasonable commander, though not as much as Hammond.
* {{Cloudcuckoolander}}: He's got this "thing" about birdwatching.
* DaChief: The 2-star General in command of Star Gate Command and the entire Stargate Project.
%%* DrillSergeantNasty: Once in a while.
* SuspiciouslySimilarSubstitute: For Hammond; notice a pattern here?
[[/folder]]

[[folder:Dr. Carolyn Lam]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Carolyn_Lam_5166.JPG]]
->'''Played By''': Lexa Doig

The SGC's new medical doctor, after a season without a recurring character in this role following Fraiser's death back in season 7. General Landry's daughter, played by Michael Shanks's wife (which was a total surprise for him when she was cast).

!!Tropes:

%%* HospitalHottie
* JerkassFacade: Used the façade to try and push General Landry, her dad, at arms length. She was pretty good at it for a while, which led to a lot of {{wangst}} on her part.
* SuspiciouslySimilarSubstitute: For Fraiser.
[[/folder]]

[[folder:MSgt. Sylvester "Sly" Siler]]

->'''Played By''': Dan Shea

A technical specialist and chief electrician at the SGC. He's responsible for managing the equipment that provides the massive power requirements of the Stargate.

He's a fairly minor recurring character, but notable for being one of only seven characters to appear in all 10 seasons, six of whom are main characters.

!!Tropes:

* ButtMonkey: He's been electrocuted countless times and is often the victim of various other [[AmusingInjury Amusing Injuries]].
* OddFriendship: He has a particular friendship with O'Neill. This is actually a CreatorInJoke: Dan Shea is also Richard Dean Anderson's stunt double for O'Neill.
[[/folder]]

!Allies of the SGC

[[folder:Bra'tac]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Bratac_5493.JPG]]
->'''Played By''': Tony Amendola

Teal'c's former teacher and his predecessor as Apophis's First Prime. Has a habit of not dying.

!!Tropes:

* BadassGrandpa: How else do you stand at the top of a warrior culture ruled by treacherous and fickle gods, well past the age of one hundred? The son of a bitch ''will not die''.
%%* CoolOldGuy: ''Very'' much.
* DeathGlare: Excellent at this, for almost any occasion. Ties in with LivingLieDetector below.
* LivingLieDetector: By staring directly and closely into a person's eyes, he is able to tell almost without fail if they are lying. He can even do this if the character has been brainwashed into lying. It didn't help him much in "The Warrior", where he fell completely for Imhotep's lies. A rare case where he picked up the IdiotBall.
* MookFaceTurn: Actually, it's later revealed that he was working against Apophis long before the events of the series, and planting seeds of doubt in Teal'c from the get-go.
%%* ObstacleExposition
* OldMaster: Fittingly enough, Teal'c addresses him as "Master Bra'tac." And so does almost everyone else, including General Hammond. When Kinsey casually calls him "Mister Bra'tac," O'Neill's quick to correct him: "It's ''[[InsistentTerminology Master]]'' Bra'tac." It can be assumed that, rather than actually referring to a teaching rank, it is actually an honorary title given to Bra'tac out of respect for his wisdom and honor.
* ReallySevenHundredYearsOld: He's 133 when we first meet him.
* RunningGag: Addressing Hammond as "Hammond of Texas"; this even continued when O'Neill replaced him as the SGC commander, with Bra'tac addressing him as "O'Neill of Minnesota." Though he seems aware the latter does not have the same ring.
* ScarilyCompetentTracker: In "Maternal Instinct", not only does he give a very detailed explanation of what the group he was tracking was doing, but he also explains exactly what tips him off to each detail.
%%* YourEyesCanDeceiveYou
[[/folder]]

[[folder:Thor]]

[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Thor_-_Stargate_SG-1_6896.jpg]]
->'''Voiced By''': Michael Shanks

One of the Asgard, a ''highly'' advanced, benevolent species of TheGreys, who posed as a god to Norse-inspired human diaspora cultures.

!!First, tropes applying to the entire Asgard race:

* AlienNonInterferenceClause: The Protected Planets Treaty.
* AnonymousBenefactor: The Asgard usually let their work speak for itself.
%%* BenevolentPrecursors: Unlike the Ancients...
* BigGood: There is no other race in ''several'' galaxies as universally kind and helpful as them. While the humans of the SGC share those moral virtues, they certainly don't represent ''all'' of humanity.
%%* BittersweetEnding
* CloningBlues: Millennia of cloning themselves has degraded their [=DNA=] quite severely.
%%* DeusExitMachina
%%* DittoAliens
* TheGreys: Roswell Greys to be exact.
* HigherTechSpecies: They ''start out'' as awe-inspiringly advanced... And only get ''more'' impressive as the show goes on.
%%* ProudScholarRaceGuy
%%* SpaceElves: The Asgard are a mix of types II and III.
* StoryBreakerPower: Being at constant war with the Replicators while also being a dying race must be the writers ways of keeping them from solving every major conflict in the Milky Way. Because if they could, they would (and in one alternate universe, they ''did'').

!!And tropes applying specifically to Thor:

* AccidentalHug: Carter gave him one once, [[NotSoAboveItAll he didn't mind though]].
* {{Badass}}: for a three-foot tall grey guy, he kicks a lot of ass. Probably something to do with the world-destroying power of the ships he commands.
* BigGood: Thor is a hero in just about every sense of the word.
* BigDamnHeroes: In "Thor's Chariot", he has the ''[[CoolStarship Beliskner]]'' descend over Cimmeria, promptly begin [[CurbStompBattle beaming away]] all the Goa'uld forces ''including'' their pyramid-ships, then simply [[ButForMeItWasTuesday turns around and leaves]].
* DeadpanSnarker: Very sarcastic when he wants to be. Many Asgard end up being this way, but perhaps especially Hermiod, the Daedalus' Asgard crewmember on ''Series/StargateAtlantis''.
* {{Fanboy}}: The majority of the Asgard hold Humanity in a quite positive regard, but Thor can only be called a fanboy of humanity. The guy names ''two'' of his ships after members of SG-1!
* HiddenDepth: Thor comes across as a fairly generic stoic BigGood, but a few scenes show there's much more to the stoic little alien. When explaining to Politicians the Asgard's support of Hammond's leadership, he explains that their friendship with humanity does not hinge on Hammond's keeping command of SGC, but immediately appends that with "But it is preferred" and says that last part in a low, almost threatening tone. Making it clear that the Asgards' stance with humanity as a whole will not change, Thor would take Hammond being removed from command as a personal slight - and as he remind Kinsey, he IS the Supreme Commander of the Asgard.
* InterspeciesFriendship: With all of SG-1 and Hammond. Mostly O'Neill, cause they're best buds. The guy even offered to take Thor fishing ''for crying out loud!''
%%* TheManBehindTheCurtain
%%* StraightMan
* TheStoic: For a cute little Roswell Grey, he's very stoic.
* TheyCallMeMisterTibbs: In an episode. Senator Kinsey keeps calling him "Commander" as Thor just dropped in on a multinational summit to decide the fate of the SGC, to give a rather impressive bit of support for General Hammond to the present politicians (Most of whom have never even seen an alien before!). Upon being called "Commander" one too many times he cuts off Kinsey "''SUPREME'' Commander", correcting him and in doing so putting emphasis on how Thor can speak for the entire Asgard race.
* {{Troll}}: Nevertheless, has a very evident sense of humor, and sometimes has fun at SG-1's and Stargate Command's expense. Perhaps especially when he offers Carter Asgard food, and tells her he likes the yellow ones. And when he beams half the food out of Stargate Command without having refrigerators, forcing SG-1 to chow down on ice cream and other perishables. Not to say they really mind. More generally, when he beams people and/or things out of the SGC unilaterally, causing [[HilarityEnsues hilarity to ensue]] in ways that are just too specific not to have been Thor's intent, at least to some degree.
[[/folder]]

[[folder:Jacob Carter/Selmak]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Jacob_Carter_670.JPG]]
->'''Played By''': Carmen Argenziano

Jacob Carter was Samantha Carter's father. When he was dying of cancer, SG-1 brought him to the Tok'ra (rebels opposing the System Lords while being the same species as the Goa'uld) to be blended with the symbiote Selmak. This cemented the alliance between the Tok'ra and the Tau'ri, although Selmak himself eventually grew out of favor among his people due to his ties to Earth. [[spoiler:Was killed off anticlimactically in the episode "Threads", for seemingly no reason other than to give his daughter something to angst over for all of one episode.]]

!!Tropes:

* AmazinglyEmbarrassingParent: Not often, but it happens.
--> '''Sam''': Welcome to ''my'' life.
* {{Determinator}}: [[spoiler: Despite Selmak's failing health meaning that Jacob could still be saved if they seperated, both refused to part from each other until their work was finished.]]
* DroppedABridgeOnHim: [[spoiler:Killed off in season 8's episode "Threads".]]
* FourStarBadass: Jacob is an Air Force two-star just like Hammond was for most of the series, although how becoming Selmak's host interacted with that isn't clear. Assuming he kept the rank afterwards, he was running special ops for the Tok'ra for most of the series as a major general.
%%* GrumpyBear
* GrumpyOldMan: Jacob isn't all that old but he sure can be grumpy sometimes.
* HumanityIsInfectious: Or rather, Earth humanity is. Selmak starts to fall out of favor with the High Council because they believe his host is influencing his judgement more than they'd like.
* JerkWithAHeartOfGold: He came across as a real jerk when he first showed up. He grew out of it pretty quickly though, for the most part, as joining with Selmak made him realise some of his own flaws and his desire to reconnect with his daughter and estranged son.

!!Applying to the Tok'ra in general:

%%* MySpeciesDothProtestTooMuch
* NotSoAboveItAll: Though they aren't the Goa'uld, they do still possess the belief of superiority to humans, which is particularly evident in the later seasons. In "Death Knell", Delek is dismissive of Jacob/Selmak while the former is in control, and believes that the Tau'ri's willful behavior makes them more dangerous than the Goa'uld dominated, complacent humans they usually work with. Taken together, it comes off as the Tok'ra not liking the fact that the Tau'ri are harder to control.
* SharingABody: It's interesting to note that the echoing symbiote voice, which the Goa'uld use to induce fear, the Tok'ra use to differentiate between the host and the symbiote.
[[/folder]]

[[folder:Skaara]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Skaara_6759.jpg]]
->'''Played By''': Alexis Cruz

Daniel Jackson's Abydonian brother-in-law, and one of two movie characters who retained their original actors. He was kidnapped from Abydos by Apophis for use as a host for his son Klorel. Much later, after he was captured by the Tollans, O'Neill and Daniel successfully argued in Tollan court for the removal of Klorel. [[spoiler:He was mortally wounded by Anubis's troops during the attack on Abydos, but Oma Desala helped him and the other Abydonians AscendToAHigherPlaneOfExistence.]]

!!Tropes:

* AscendToAHigherPlaneOfExistence: [[spoiler:Oma Desala helps him and the other Abydonians ascend to escape an EarthShatteringKaboom courtesy of Anubis' superweapon.]]
* AndIMustScream: Possibly like all the people who've ever been possessed by a Goa'uld.
%%* BreakTheCutie
* FightingFromTheInside: Has enough HeroicWillpower to delay Klorel's actions, though it's not enough to stop him entirely.
%%* GoOutWithASmile
%%* HeroWorshipper: Towards O'Neill.
* MyGodWhatHaveIDone: Feels like this for actions that were actually done by [[PuppeteerParasite Klorel]].
%%* NiceGuy
* WhatHappenedToTheMouse: In his last appearance, after he [[spoiler: ascends]], he lampshades that it'll be a while before he sees Jack again.
%%* WideEyedIdealist
%%* WildHair
%%* [[WhenSheSmiles When He Smiles]]
[[/folder]]

[[folder:Colonel Chekov]]
[[quoteright:300:http://static.tvtropes.org/pmwiki/pub/images/Colonel_Chekov_5388.png]]
->'''Played By''': Gary Chalk

A Russian Air Force colonel who was implied to have been upper management during the Russians' abortive attempt at a parallel stargate program in "Watergate". Chekov first appeared in the aftermath of a disastrous joint SGC-RAF operation to infiltrate the tomb of the slain System Lord Marduk during which all but one Russian team member was killed. He and Jack didn't get along, though he had fairly good relations with Daniel. Later episodes essentially established him as the Russian Air Force liaison to the SGC. [[spoiler:"Crusade" saw him take command of the ''Daedalus''-class battlecruiser RFS ''Korolev'' on her maiden voyage. He was killed in battle along with his entire crew.]]

!!Tropes:

* GoingDownWithTheShip: [[spoiler:In command of the ''Korolev'' when she was lost with all hands after taking two direct hits from an Ori mothership's WaveMotionGun.]]
* {{Hypocrite}}: Often called the american government, and the people at the SGC by extension backstabbing liars. Takes one to know one buddy.
* NoNameGiven: We never did find out his given name.
* {{Realpolitik}}: A friendlier version than most. Chekov was all in favor of the stargate tech-sharing agreement between the United States and Russian Federation, but notes in "Disclosure" that it's partly because taking a backseat to the US means that Russia can let the SGC shoulder most the budgetary burdens of adapting alien technology. He also helped foil a Goa'uld attempt to start WorldWarThree in "Full Alert," which needs no explanation.
* WhatTheHellHero: Repeatedly calls out the Americans on dragging their feet in regards to exchange of technologies gathered through the stargate program. Though considering all the nasty backstabbing things ''his'' government often did, makes his arguments all seem very hypocritical. See {{Hypocrite}}.
[[/folder]]

!Goa'uld

[[folder:Ra]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Ra_-_Stargate_8618.JPG]]
->'''Played By''': Jaye Davidson

The villain of the original ''Film/{{Stargate}}'' movie, Ra was an ancient alien who enslaved primative mankind, founded ancient Egypt and thus regards himself as the creator of human civilization. He maintained power by using his SufficientlyAdvancedAlien technology to pose as a god, and was the source of the mythology of the Egyptian god Ra. He was killed by the Tau'ri stargate team at the end of the movie. Was ret-conned in the TV series as being the most powerful of the Goa'uld, an entire species of parasitic aliens who pretty much followed the same modus operandi.

!!Tropes:

%%* BigBad: Of ''Film/{{Stargate}}''.
* DeathByOriginStory: Only relevant to the TV series via his death in the movie.
* TheEmperor: Was Supreme System Lord before his death, the most powerful Goa'uld System Lord.
* NukeEm: Daniel and Jack got rid of him by ringing a tactical nuclear warhead aboard his ship.
* OlderThanTheyLook: An ancient alien entity possessing the body of an Egyptian teenager.
%%* StarterVillain
[[/folder]]

[[folder:Apophis]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Apophis_-_Stargate_SG-1_2773.jpg]]
->'''Played By''': Peter Williams

The original BigBad of the TV series. The brother of Ra, Apophis attacked Earth and later Abydos, in the process kidnapping Daniel Jackson's wife Sha're, causing the Stargate program to be reformed to combat the new threat of the Goa'uld. He was actually only one of many competing Goa'uld System Lords, and over the course of the series he rose and fell in power due to SG-1's actions. After [[NotQuiteDead several apparent returns from the dead]], he was finally [[DeadForReal Killed For Real]] by the EvilerThanThou Replicators.

!!Tropes:

* AintTooProudToBeg: In "Serpent's Song", he isn't above pleading for his life, and even offers all the knowledge of the Goa'uld Empire in return. (Whether he would have actually done so is arguable.)
* ArchEnemy: To SG-1, and has reasons to hate all them individually.
* BeardOfEvil: The "real" Apophis lacks one, but his alternate selves in "Point of View" and "Moebius" sport Goatees of Evil.
* BigBad: For the first and fourth seasons. The loss of his ships made him too weak to be the BigBad for Season 2. He was in fact defeated and tortured by Sokar midway through Season 2; and Sokar would go on to be the BigBad for Season 3.
* BladeBelowTheShoulder: While on Netu, he has a hidden wrist-mounted blade with which he intends to kill Sokar. He doesn't succeed, but does manage to take out Sokar's guards using it.
* EvenEvilHasLovedOnes: He really seems to care for [[UnholyMatrimony Amaunet]] (even desperately calling out for her while dying in "Serpent's Song") and Klorel. Subverted with Ra and Heru'ur, his own brother and nephew respectively, and presumably also with [[ChildByRape Shifu]], who he conceived for with the sole intention of having him as a future host.
* GoodScarsEvilScars / FacialHorror: When he turns up on Netu in "Jolinar's Memories" [[TwoFaced the right side of his face is a mass of scar tissue partially covered by a metal plate]]. He evidently had some reconstructive surgery done between "The Devil You Know" and his next appearance in "The Serpent's Venom" (shown).
* ManipulativeBastard: Amongst other things, he was able to brainwash Rya'c and later Teal'c fairly easily.
* MarsNeedsWomen: Captured Sha're to serve as a host for his queen Amaunet.
* NotQuiteDead: Escaped what seemed like certain death so many times, that even after he was finally slammed into a planet at superluminal speeds, Jack O'Neill was "100 percent certain ... 99 percent certain that Apophis is dead."
* RoyalsWhoActuallyDoSomething: Unlike most of the other System Lords, Apophis wasn't afraid to lead from the front, and was willing to fight alongside his Jaffa on a few occasions. His original outfit was a more decorated version of Jaffa combat armor, in contrast to the dress robes worn by most other Goa'uld.
* TortureTechnician: In "The Devil You Know" he has all of SG-1 and Martouf/Lantash tortured and {{mind rape}}d for information.
[[/folder]]

[[folder:Lord Yu]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/lord_yu_1116.jpg]]
->'''Played By''': Vince Crestejo

The eldest of the Goa'uld System Lords. Yu was introduced in the third season when he came to Earth as a Goa'uld ambassador. Though never a BigBad, he is noteworthy for being one of the longest-running ''Stargate'' villains and for his unusual personality among the Goa'uld.

Yu was a pragmatic villain: untrustworthy, but more practical than most System Lords. He [[EnemyMine cooperated with the Tau'ri when it benefited him]] and [[NobleDemon followed a personal code of honor]]. However, by the seventh season, old age was catching up to him. He became increasingly senile and his ImmortalityInducer was beginning to lose its effect on him. Ultimately, Replicator Carter killed him in season eight.

!!Tropes

* AGodAmI: {{Downplayed|Trope}}. He seems to believe in his godhood, but rarely asserts it, and on Earth, he assumed the role of an emperor instead of a god.
%%* BeardOfEvil
* BeethovenWasAnAlienSpy: He was one of China's earliest emperors, Yu the Great. According to the RPG and the EU novel ''Four Dragons'', his First Prime Oshu is a the last of a line of clones of SunTzu, who was a member of Yu's royal guard.
* CompositeCharacter: He has been referred to as both Yu the Great and the Jade Emperor, separate figures in Chinese mythology. Though he could have posed as both at different times.
* DragonInChief: Due to his mind failing, his First Prime, Oshu, ended up basically running Yu's domain for him. Unlike most examples, he stayed loyal to his master right up to the part where [=RepliCarter=] killed them both.
* EnemyMine: When it suits his goals, he cooperates with the SGC, such as when both parties turn their attacks against Anubis.
* ImpaledWithExtremePrejudice: [=RepliCarter=] runs him through with her [[BladeBelowTheShoulder arm-blade]].
* NobleDemon: He has made several positive influences during his reign, and generally keeps his promises (at least until he has trouble thinking straight anymore).
* PragmaticVillainy: Unlike [[StupidEvil other Goa'uld]], he's more concerned with strengthening his own domain than wasting resources for galactic domination. According to Daniel Jackson, Yu cannot be trusted, only counted on to make a practical decision. Daniel also noted during Yu's first appearance that, though a tyrant, he was responsible for a number of positive influences on humanity.
* WhosOnFirst: His name is the subject of so many "Yu"/"You" puns that the cast actually [[OverusedRunningGag put a moratorium on them]].
-->'''Daniel Jackson''': Don't. Every joke, every pun, done to death. Seriously.
[[/folder]]

[[folder:Anubis]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Anubis_-_Stargate_SG-1_7036.jpg]]
->'''Played By''': David Palffy, [[spoiler:George Dzhundza]]

Replaced Apophis as the series main BigBad. Initially introduced as a mysterious new Goa'uld who launched attacks against all major galactic power-players (including the other Goa'uld and also the Earth), and was able to gain power rapidly due to possessing technology significantly more advanced than anyone else's, eventually becoming the most powerful power bloc in the galaxy. He was eventually revealed to be an evil [[EnergyBeings energy being]], having Ascended and gained scientific knowledge on par with that of the [[NeglectfulPrecursors Ancients]]. He was smarter, eviler and more GenreSavvy than the series other Goa'uld villains, yet at the same time was also significantly more melodramatic, drawing comparisons to Darth Vader and Emperor Palpatine [[LampshadeHanging even amongst the show's own characters]]. He differs from other Goa'uld in that he doesn't simply want to be the supreme ruler of the galaxy. His goal is to annihilate ''all life'' in the galaxy.

He was opposed by an alliance of all other galactic power blocs (including the Earth and the Goa'uld), and ultimately was defeated in a massive finale that also saw the destruction of both the Replicators and the System Lords, thus ending the original ''Stargate SG-1'' series (making way for the PostScriptSeason involving the Ori plot arc).

!!Tropes:

* AGodAmI: As per Goa'uld tradition. Interestingly, he actually admits that defeating Daniel in the Season 6 finale was not his doing.
* AscendToAHigherPlaneOfExistence: He managed to ascend, then was chucked halfway back down to the lower planes.
* BigBad: Season 5 saw a power vacuum develop among the System Lords following the deaths of Sokar, Heru'ur, Cronus, and Apophis in quick succession due to Tau'ri and Tok'ra actions. As the remaining System Lords jockeyed for position, a new mystery Goa'uld started hitting them hard, also finding time to flatten Tollana. The "Summit"/"Last Stand" two-parter revealed that the Goa'uld in question wasn't so new. Anubis remained the BigBad through season 8's "Threads".
* BodySurf: After his initial "body" was destroyed, he instead manifested by possessing human hosts, hopping to a new host when his energy caused the current one to start melting into goo.
* CameBackWrong: After Ascending, the others attempted to kick him out for being unspeakably evil. They were only partially successful and left him as a half-ascended abomination of a PhysicalGod.
* CardCarryingVillain: It's implied that he is very much aware of how evil he himself is. He was so bad that in the past, ''[[EvenEvilHasStandards the rest of the Goa'uld booted him from the System Lords!]]'' They deemed his actions ''unspeakable.''
* DarkLordOnLifeSupport: Technically he can survive without it, but he needs assistance in order to interact with our world. Through "Lost City" that assistance was the force-field suit shown in the page image. After it went up with his flagship courtesy of the Ancient outpost's drone weapons, he was forced to BodySurf between human hosts, which treated him like a disease and gradually broke down.
%%* TheDreaded
* EvilerThanThou: Was opposed, at one time or another, by pretty much every remaining major villain on the show, sometimes in conjunction with SG-1. The various petty Goa'ulds who served him were fools; his end game included ''the annihilation of even his own race'' along with the rest of all life in the Milky Way.
* {{Expy}}:
** Of Emperor Palpatine ''Franchise/StarWars''. Evil emperors who are exceptionally evil even for their own kind, mostly remaining on their thrones after taking power. They actually wear the same type of dark cloak.
** Also of Sokar. Both are introduced as exceptionally evil Goa'uld, exiled from the System Lords for being [[EvenEvilHasStandards too evil, even by their standards]]. They even have a [[InTheHood similar fashion sense]], and were played by the same actor to boot.
* TheFaceless: Sported the classic BlackCloak look, due to really being disembodied energy occupying a man-shaped forcefield body.
* FauxAffablyEvil: As Jim in "Threads". At first, he comes across as friendly, and is very talkative. Of course, once Daniel figures out who he is, he drops the facade in a heartbeat.
* ForTheEvulz: Most notably when he destroys Abydos just because he can.
* GenreSavvy: Despite being even more melodramatic and hammy than most Goa'uld, he is actually a good deal less arrogant, and manages to avoid falling into the kinds of pitfalls that doomed dozens of System Lords. Notably, he accepted input from his subordinates and never underestimated SG-1 or the humans of Earth. After all, he showed up above a planet with a single ship (''Prometheus'') equivalent to, at most, one and a half standard Goa'uld motherships with the largest fleet ever assembled by a Goa'uld. He lost, but that had nothing to do with preparations for or actions during the battle. What arrogance he does display is warranted, given that he does possess technology far superior to that of most Goa'uld.
* HeroKiller: He devastated the Tok'ra, wiped out the Tollan, and destroyed Abydos. He also destroyed the Alpha Site, which lead to the fracturing of the Earth, Tok'ra, and Jaffa alliance; and one of his men killed Dr. Fraiser.
%%* HumanoidAbomination
%%* InTheirOwnImage
%%* KnightOfCerebus
* LargeHam: Even by Goa'uld standards.
-->'''Anubis:''' I am Anubis. Humans of the Tau'ri. Your End Of Days finally approaches. There will be no mercy!\\
'''Jack O'Neill:''' Aw c'mon. Who talks like that?\\
--->''(later)''
--> '''Rodney [=McKay=]:''' Ya, Anubis? This your agent. You're playing it ''way'' over-the-top! You need to get serious!
* TheMole: In the form of Jim he pretends to be a good guy to Daniel, but ultimately reveals himself to be the most evil Goa'uld SG-1 has ever fought.
* MustHaveCaffeine: A minor RunningGag during "Threads" is Jim asking for coffee from Oma. Played with, as it's only a representation of Daniel's mind, so we don't really know what Jim is "consuming" (or if he even needs to).
* NearVillainVictory: He was ''seconds'' away from wiping out all life in the galaxy before [[spoiler:Oma made her decision]].
* OmnicidalManiac: His final plan was to use the Dakara superweapon, whose gate had been reprogrammed to link to every gate in the galaxy in the previous episode so it could be used against the Replicators, to cleanse the Milky Way of life and make himself its new god.
* SealedEvilInADuel: [[spoiler:Oma Desala's HeroicSacrifice in "Threads" involved her binding him on the higher planes by forcing him to battle her for all eternity.]]
* SoftSpokenSadist: Jim seems really friendly, but takes a perverse glee in the Ancients' punishing Oma by forcing her to watch him do his thing.
* TheSymbiote: A truer parasite than most Goa'uld since the host body actually treats his half-ascended form as a disease.
%%* TouchedByVorlons
[[/folder]]

[[folder:Ba'al]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Baal_-_Stargate_SG-1_7571.JPG]]
->'''Played By''': Cliff Simon

A Goa'uld System Lord introduced about halfway through the series total run. Although he never became the BigBad, he was a consistent secondary villain, often opposing both SG-1 as well as the series current BigBad, making him something of the series [[TheStarscream Starscream]]. Like Starscream in ''WesternAnimation/TransformersAnimated'', he even created a small army of clones of himself in order to cheat death and be in several places at once.

Although power-hungry, Ba'al was somewhat subtler and more reasonable than the standard "megalomaniacally melodramatic" Goa'uld villains. He also seemed to have a better understanding of human nature than was typical of the Goa'uld, including having an ironic sense of humor, and eventually even speaking in a normal voice instead of the Goa'uld's Scary Echo Speak.

!!Tropes:

* AscendedExtra: Was introduced amidst a bevy of System Lords in ''Summit''. He was such a great character that they brought him back as a recurring character.
* AGodAmI: ''Averted''. After the fall of the System Lords, he freely admits that he, and all the other Goa'uld, are not Gods, and notes that only the especially crazy Goa'uld end up believing themselves to be a God.
* AffablyEvil: Ba'al often tries to pull this in the later seasons, but it ultimately never works due to his Goa'uld nastiness as well as his enemies' [[GenreSavvy genre savviness]].
* ArchEnemy: O'Neill hates him more than any other Goa'uld for torturing him endlessly, though he's subtle about it. Ba'al seems to despise O'Neill in turn.
* BelligerentSexualTension: A ton with Adria, despite their relatively limited interaction. Similar in many ways to the tension between Mal and Inara in ''Series/{{Firefly}}'', and thus possibly a deliberate reference. Gets a little strange, complicated, and maybe a little squicky when Ba'al [[spoiler: implants himself (a clone Goa'uld) into Adria in an effort to take control of the Ori forces in the Milky Way. It works, for a while.]]
* BigBad: {{Averted|Trope}} during the series. Despite his prominence as a villain he never actually makes the jump to BigBad. In ''Film/StargateContinuum'' he sort of shares BigBad status with Qetesh: [[spoiler:She's the BigBad of the AlternateTimeline after she kills him, but he was the one who started the whole thing and ends up being the final boss for Mitchell.]]
* BrickJoke: A rather dark ContinuityNod. In "Abyss," he repeatedly tortures O'Neill to death, often using knives. Fast-forward to "The Quest", when he has to relinquish a posession, they tell him to drop in his knife, which he at first refuses, claiming it has... "sentimental value."
* BunnyEarsLawyer: For a System Lord, particularly after his time on Earth resulted in him GoingNative.
* CivilianVillain: Briefly set up shop as an Earth businessman after the Replicators ate all the other System Lords.
* CrazyEnoughToWork: All of Ba'al's plans are ludicrously audacious, which is a big part of why they generally succeed. It's a testament both to his skill and the sheer, unmitigated gall of his plans that he manages to outlive all the other villains on the show, lasting five seasons and one movie.
* DangerouslyGenreSavvy: Especially in ''Film/StargateContinuum''. It's a PeggySue plot with him using all his knowledge and GenreSavvy. If he won, it's indicated the universe would have actually been pretty nice, albeit under the heel of a god-king.
* DeathIsCheap: After he became a series of clones rather than an individual character, it kind of became a running joke to have him killed repeatedly (often within the same episode), only to have him be back for more a few episodes later.
* EmperorScientist: Is a genius in his own right, and definitely has ambitions to rule the galaxy (which he almost managed in the aftermath of Anubis' defeat, but before the arrival of the Replicators, and [[spoiler:in the alternate timeline of ''Continuum'']]). A brilliant computer scientist, he understands the Gate system and the Ancient's incredibly complex, elegant dialing program better even that Samantha Carter. He also managed to clone himself many times over, increasing his power manyfold, managed to steal Asgard beaming technology from Anubis (who stole it from Thor), took control of the invincible Kull warriors from Anubis, defeated the Replicators (SG-1 couldn't have wiped them out without his dialing program, though Nerus may have had a hand in that), the list goes on.
* EnemyMine: Ba'al is more than willing to work with [=SG1=] whenever there's a greater threat that needs to be dealt with. After all, he doesn't want someone ''else'' taking over the galaxy.
* GoingNative:
** In Season 9, he spends some time hiding on Earth and afterwards started to incorporate into his schemes ideas he got from past missions of the SGC. He also started using the human voice and, in ''Film/StargateContinuum'', he called the president with a cell phone to discuss a "peaceful" solution. (The other Goa'ulds thought he went insane because he didn't use the traditional "blast them back to the Stone Age" solution.)
** He also starts to dress in Earth fashions by the end of the series, and even implies in ''Continuum'' that the reason he never bothered to invade Earth was simply because he's become rather fond of it, recognising that Earth is far more valuable an asset if it remains as it is.
* InsufferableGenius or KnowNothingKnowItAll: Depending on the episode.
* KarmaHoudini: For most of the series he escapes justice, although his plans often fail. Ultimately subverted when he's executed by the Tok'ra in ''Continuum''.
* PoliticallyIncorrectVillain: Quite the misogynist, making several sexist comments toward Carter throughout the series. It eventually gets him punched in the face.
* PowerParasite: Attempted to control [[PhysicalGod Adria]], [[spoiler: and briefly succeeded until the intervention of SG-1.]]
* PragmaticVillainy:
** Ba'al wants to win, but win long term. ''Film/StargateContinuum'' shows that ultimately we would've loved him as our ruler, and he would've kept Earth safe, being probably a safer and better world if he won, except for the whole GodEmperor thing...
** He also, unlike most Goa'uld, actually seems to understand that the "AGodAmI" act ''is'' just an act, propaganda to intimidate the ignorant into obedience. As a result, he doesn't allow indignant outrage at the notion of mere humans daring to oppose him get in the way of carrying out his plans.
* SendInTheClones: Starts cloning himself in season nine, which leads to amusing circumstances where he gets killed multiple times in the same episode.
* TheStarscream: Ironically, managed to outlast all the actual {{Big Bad}}s, becoming the series longest running villain.
* TortureTechnician: Repeatedly tortured O'Neill to death.
* WorthyOpponent: It's possible that he may consider [=SG1=] to be this. While he's far too pragmatic to let something like honor get in the way of a chance to take out [=SG1=], it's clear that he holds at least some degree of respect for them.
[[/folder]]

![[GreyGoo Replicators]]

[[folder:Replicators in general]]

!!Tropes:

* AIIsACrapshoot: Originally, the Replicators were [[spoiler: toys for a very childish RobotGirl]]. She taught them how to make more of themselves, and how to defend themselves if they were attacked. Once they became so numerous that she couldn't control them anymore, they fell back on these two instructions and have been following them ever since.
* BishonenLine: The human-form replicators demonstrate more intelligence and coordinate the others.
* BlueAndOrangeMorality: They see nothing wrong with the destruction of entire civilizations, and their sense of right and wrong revolves around what will allow them to increase their population.
* EvilerThanThou: They easily overpower the Goa'uld near the end of season 8, even tearing apart the NighInvulnerable Kull Warriors.
* FromNobodyToNightmare: [[spoiler: They were originally toys.]]
* GalacticConqueror: The Asgard home galaxy and the Milky Way were both nearly overrun by them.
* HordeOfAlienLocusts: They exist purely to consume advanced technology and materials in order to make more of themselves.
* HiveMind: Implied, though their exact workings aren't clear.
* ItOnlyWorksOnce: Thanks to [[spoiler:[=RepliCarter=]]] fooling the SGC into letting her mess with the Replicator disruptor built by Jack in "New Order," the Replicators develop a way to shield themselves from its effects such that, unless you blast every Replicator at once, the survivors will adapt to its effects.
* JustAMachine: Daniel Jackson claims this makes them unable to comprehend Ancient knowledge.
* {{Nanomachines}}: Human-form Replicators are made of these.
* OmnicidalManiac: They don't necessarily want to kill all life, it's just getting in the way of their replication.
* RockBeatsLaser: Almost impervious to the energy weapons of the most advanced races in the galaxy, not so much to a P90.
* SlidingScaleOfRobotIntelligence: Level 4 for most of the series, but edge closer to 5 under the command of the human-form replicators.
* ZergRush: The only combat tactic they ever use is spamming vast numbers of combat forms at the enemy. Thanks to their energy weapon resistance Tau'ri [[MoreDakka Dakka]] is about the only counter there is.

[[/folder]]

[[folder:Replicator Carter]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/replicatorcarter_6561.jpg]]
->'''Played By''': Amanda Tapping

A human-form Replicator created by Fifth in the image of Sam Carter, trained to kill the original. She also grew to hate Fifth and tricked SG-1 into helping her destroy him, then turned on them and became the Season 8 BigBad.

!!Tropes:

* ActingForTwo: Whenever she and Sam appear at the same time, as they're both played by Amanda Tapping.
%%* BigBad: Of Season 8.
* BladeBelowTheShoulder: Her preferred method of killing is turning her arm into a sword and stabbing people with it.
%%* RobotMe: Of Carter.
%%* TheStarscream: To Fifth.
[[/folder]]

[[folder:Fifth]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Fifth_8836.JPG]]
->'''Played By''': Patrick Currie

The fifth human-form Replicator to be created, he featured a quality that his fellow human-form Replicators lacked: emotions. O'Neill took advantage of this, tricking him into helping SG-1 escape and [[SealedEvilInACan leaving him and the others trapped]] by a TimeDilation device. Reappears in Season 8 seeking revenge.

!!Tropes:

* AIIsACrapshoot: Played with. The FatalFlaw that becomes his undoing? He was made too ''[[RidiculouslyHumanRobots human!]]''
* FaceHeelTurn: After SG-1 leaves him for dead.
* HoistByHisOwnPetard: [[spoiler: Creates Replicator Carter as his companion, only to be destroyed by her.]]
%%* TinMan
* WhatTheHellHero: Does not react well to SG-1's betrayal.
[[/folder]]

![[ScaryDogmaticAliens Ori]]

[[folder:The Doci]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Doci_3740.JPG]]
->'''Played By''': Julian Sands

The leader of the Priors, the Ori's "clerics"/priests. The Ori can also possess the Doci to speak directly to humans. Like the Priors, the Doci worships the Ori out of a genuine sense of religious devotion and is unaware of their true nature.

!!Tropes:

* EvilAlbino: His bizarre coloring is a byproduct of [[TouchedByVorlons Ori empowerment]].
%%* KnightTemplar
* MouthOfSauron: The Ori never physically appear, but they deliver orders to the Priors through him. They can also possess him to speak to others directly.
%%* MyGodWhatHaveIDone: In ''Film/TheArkOfTruth''.
%%* PathOfInspiration
* TouchedByVorlons: Like the other priors, he was created by the Ori by zapping the human he used to be with their ascended powers to forcibly evolve him.
[[/folder]]

[[folder:Adria the Orici]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Adria_813.jpg]]
->'''Played By''': Creator/MorenaBaccarin

Adria was "conceived" by the Ori, and is the "virgin birth" daughter of Vala Mal Doran ("virgin birth" in quotes since Vala was hardly a virgin, if you get my drift). A human possessing the vast cosmic powers of the Ori, she was created as a sort of [[DarkMessiah Ori Messiah]] to lead the conquest of the Milky Way Galaxy. Being effectively an Ori in a human body, Adria ''is'' fully aware of their true nature. Although she has a sentimental attachment to her mother, she's otherwise quite evil and sadistic, just like her Ori progenitors.

Since the Ori themselves are a concept rather than actual characters, Adria mostly serves as the final BigBad of ''Stargate SG-1''. After the Ori are destroyed by Daniel Jackson, Adria absorbs their combined power (or more precisely, since the Ori draw their power from worshipers and she's the only Ori left, she gets everything that used to be shared among the group) and attempts to [[TakeOverTheWorld take over the universe]] (she fails, of course).

!!Tropes:

* AGodAmI: Like the Goa'uld, Adria actually ''believed'' herself to be a god, although perhaps more justifiably, since unlike them she's actually an EnergyBeing with innate godlike powers.
%%* BigBad: For Season 10 and ''Film/TheArkOfTruth''.
%%* CrystalDragonJesus: See below.
%%* DarkMessiah
* RedEyesTakeWarning: Her eyes seem to change color based on her mood. When she's calm, as at right, they're brown. At other times they were red, and at still others they blazed with flames.
* SealedEvilInADuel: [[spoiler:How she was finally got rid of in the ''Ark of Truth'' movie.]]
* {{Tykebomb}}: Pretty much created expressly for the purpose of taking over the Milky Way.
* YoungerThanTheyLook: Actually only about a year old, grown to adulthood over the course of a few days via accelerated aging.
[[/folder]]

!Human Enemies

[[folder:Colonel Frank Simmons]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Frank_Simmons_4977.jpg]]
->'''Played By''': Creator/JohnDeLancie

A US Air Force colonel affiliated with the rogue NID operation. He repeatedly interfered with SGC operations, including stealing a Goa'uld-infested gazillionaire out from under them. He was finally arrested and convicted of treason, but that wasn't the end of it.

!!Tropes:

* ArcVillain: Acted as a recurring antagonist for part of season five between the death of Apophis and the rise of Anubis.
%%* {{Jerkass}}
%%* JerkWithAHeartOfJerk
* ThrownOutTheAirlock: [[spoiler:After the Goa'uld infesting Adrian Conrad jumped hosts to him in "Prometheus", he tried to kill O'Neill, who spaced him.]]
[[/folder]]

[[folder:Senator Robert Kinsey]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Robert_Kinsey_9371.jpg]]
->'''Played By''': Ronnie Cox

A US senator who initially learned of the SGC by demanding to know what black project the Air Force was dumping millions of dollars into out in Colorado. He continually tried to have the command shut down and/or transferred to his control, and collaborated with the rogue NID frequently. In season 7 he was elected vice president, then promptly fired when President Hayes lost patience with him in "Lost City".

!!Tropes:

%%* CorruptPolitician
* {{Eagleland}}: Type 2. He honestly believes that the Goa'uld and their advanced weapons and starships are ''[[SmallNameBigEgo nothing]]'' against the might of the [[PatrioticFervour Red, White and Blue]], by God!
%%* {{Jerkass}}
* KnightTemplar: He explained this himself very well, using it to justify the very hypocrisy O'Neill had just called him out on:
--> "The only currency in [[UsefulNotes/WashingtonDC this town]] ''is'' power. So if I have to [[DealWithTheDevil shake hands with the Devil]] to do the Lord's work, then so be it."
* LaserGuidedKarma: Every crime that he did eventually came back to haunt him when Anubis came to Earth, culminating in the President, after having read incriminating evidence against Kinsey, deciding to force him into "early retirement" from being the Vice President, and also implies that if he didn't, he would have done far worse to him as he "had enough evidence as to have [Kinsey] shot." [[spoiler:He was even taken as a Goa'uld host, after all those years of saying the snakes were no real threat to earth.]]
* NoPartyGiven: Though fan theories often make him Republican, his only real political affiliation is "antagonist". He jumps from conservative Christian to "big government" liberal to blindly trying to reduce the budget to cynical anti-military left winger to rabidly nationalistic belief in American invincibility. Sometimes in the course of one scene.
%%* ObstructiveBureaucrat
* RunningGag: Invariably gets aliens' titles wrong.
* TooDumbToLive: He repeatedly tries to get the Stargate program shut down, even though the Goa'uld are ''already'' aware of humanity and have learnt the location of Earth. Just how stupid this is gets lampshaded by ''everyone''.
* WhatHappenedToTheMouse: He's pretty much the only major villain whose ultimate fate was never definitively resolved. The last we see of him, he gets possessed by a Goa'uld, who then kills his Goa'uld boss and makes a VillainExitStageLeft using a handy nearby shuttlecraft.
[[/folder]]

[[folder:Colonel Harry Maybourne]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/Harry_Maybourne_8338.jpg]]
->'''Played By''': Tom [=McBeath=]

The initial ringleader of the rogue NID operation. Eventually SG-1 finds evidence incriminating him for treason; he defects to the Russians and helps them set up their own abortive Stargate Program. SG-1 captures him, then breaks him back out when they need help against the NID; he goes on the lam. After helping out the SGC repeatedly against its earthly enemies, they eventually move him off-world for his own protection.

!!Tropes:

* BecomingTheMask: Despite conning a primitive planet into making him their King, he later realises that he's genuinely come to care for the people he rules over and selflessly set about establishing a fair legal system and introducing technology to help their society, making him the wise and beloved leader they all ''thought'' he was. He's as shocked as everyone else.
* EmperorScientist: The real secret behind the "prophecies" that led to him becoming king is that he was able to read an Ancient column made by a time traveler that documented future history of the planet. In addition, he also uses his modern knowledge to introduce new technology to the primitive inhabitants of the planet.
* TheGoodKing: Though he gains the position through lies and deceit, he eventually shapes into this when he becomes king of a relatively primitive planet.
* HarmlessFreezing: In "''Watergate''", he walks into a freezer to stop a water-based alien taking control of his body. The alien in turn put him into a former of stasis, preventing him from dying.
* HeelFaceTurn: After becoming a wanted man, he helps out O'Neill and is eventually smuggled off-world by the SGC.
* HiddenDepths: After manipulating his way to the top of a primitive culture, he discovered he was actually a pretty capable ruler.
%%* KnightTemplar: At first.
* LoveableRogue: Became this after making his full Heel Face Turn in Season 4's "Chain Reaction".
* PerpetualTourist: For a while, after his treason conviction.
* VitriolicBestBuds: After a ''long'' period of antagonism, his later episodes with O'Neill began to veer towards this. Jack seems to no longer harbour an uncontrollable urge to shoot him. At least not often.
[[/folder]]

[[folder:The Trust]]
The shadowy group of businessmen pulling the strings of the rogue NID operation. They grew rich(er) off of patents derived from reverse-engineered alien technology, and launched their own wildcat operations against enemies and allies alike with little regard for how it affected our legitimate efforts.

!!Tropes:

%%* CorruptCorporateExecutive
* DoesThisRemindYouOfAnything: The Trust seems to be an oblique reference to the military-industrial complex.
* EvilVersusEvil: Besides having their own misguided way to fight the Goa'uld, at one point they tried to assassinate Senator Kinsey.
* LaserGuidedKarma: [[spoiler:After their operatives' gas attacks on the Goa'uld using the Earth gate were shut down by SG-1 they were forced to head out into the galaxy to find another gate to continue with. They ended up captured by Ba'al, who had them infested and, following his defeat in "Reckoning," eventually took over the Trust.]]
* TheManBehindTheMan: To the rogue NID agents, whom they secretly control.
* WellIntentionedExtremist: Though the Trust was motivated mainly by {{greed}}, they also genuinely thought the SGC wasn't living up to its mandate to advance Earth's interests in the galactic arena. Unfortunately their approach had a way of pissing off Earth's allies: instead of trying to trade or borrow tech (and frequently butting up against politics and [[AlienNonInterferenceClause alien non-interference clauses]]), their operatives simply stole the tech and damn the consequences for Earth. In season 3 this nearly resulted in the Tollans, Tok'ra, and Asgard breaking off diplomatic relations. In season 8 they branched out into [[spoiler:''stealing the freaking Stargate'' and using it to launch chemical attacks indiscriminately against ostensibly Goa'uld worlds. Since they didn't exactly check beforehand to see who was ''actually'' in control there, this resulted in the deaths of millions of rebel Jaffa and at least one Tok'ra.]]
[[/folder]]
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