The leader of the original SG-1 team. Gradually went from the tough, no-nonsense portrayal pioneered by Kurt Russell in the movie to a more light-hearted and sarcastic character that RDA was more accustomed to playing. Had zero tolerance for Technobabble. As of Stargate Universe, he is a three-star general.
Actor Allusion: O'Neill is from Minnesota, the same state MacGyver is from (also Richard Dean Anderson's home state). Like MacGyver, O'Neill is an astronomy enthusiast (MacGyver was shown living in an observatory in the pilot of his TV show). An inversion: Jack likes having a gun and will protest whenever he's told to not carry one, while MacGyver did not like guns and was known for avoiding their use. Like MacGyver, O'Neill is an avid fisherman. Both MacGyver and O'Neill are shown to be hockey fans.
Beware the Silly Ones: 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.
Aliens pretending to be deities, even for altruistic reasons
Big Good: 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.
Book Dumb: It's implied that he's actually a lot smarter and more knowledgeable than he lets on, but just pretends to be dumb in order to mess with people, leading to a stunned pause when he knew what an "accretion disk" is.
The Combat Pragmatist: 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.
The Chosen One: 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.
Chronic Hero Syndrome: 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.
Deadpan Snarker: So much so that when a doppelganger starts aping him with deadpan, emotionless tones, no one thinks this is strange at first.
Does Not Like Women: 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 scientists.
Good Is Not Nice: 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.
Jerkass Fašade: 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 Nice Guy, unless his pet peeves have been pushed.
Jerk Jock: 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 Odd Friendships with them both. He goes so far to describe Carter as "A natural resource, if not a national treasure".
The McCoy: 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 Bigger Stick 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.
Man Child: He sometimes acts like this when he is relaxed and off-duty.
The Nicknamer: 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.
Obfuscating Stupidity: 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.
Put on a Bus: 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.
Rank Up: Promoted twice during SG-1, then again between Atlantis and Universe.
Throw It In: According to the producers on commentaries, most of O'Neill's humourous dialogue for the first two seasons were improvised by RDA. After that, the writers got used to his sense of humour.
Turn In Your Badge: Subverted. It was a Reverse Mole role he played as part of a sting operation against a rogue element that had infiltrated the SGC.
Ultimate Job Security: 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 As Himself on the show) if he'd met officers as bad as Jack. "Worse," was the reply.
The Watson: 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.
Dr. Daniel Jackson
Played By: Michael Shanks
The Lancer crossed with The Smart Guy 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 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 The 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 Back from the Dead thanks to Applied Phlebotinum or intervention of Sufficiently Advanced Aliens. In fact, when Michael Shanks decided to leave and later reconsidered, he stayed dead (and ascended) for an entire season.
And Starring: Starting with season 7, he appeared in the opening under "And Michael Shanks as Daniel Jackson."
Daniel: Fun? You think making me live the worst moment in my life, over and over, is FUN?!
He HATES the Goa'uld for what they did to at least two women he loved, to the point where after being told not to kill a tank full of infant Goa'uld because he'd be no better than them if he did, he goes ahead and does it anyway
Loophole Abuse: 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.
Martial Pacifist: Daniel really does not like violence, and greatly prefers trying to talk to the opposition, instead of shooting them. In the event that he isprovoked 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.
Meaningful Name: Possibly accidental, but as mentioned in "Upgrades", "Daniel" means "God is my judge" in Hebrew. Think about that for a minute.
Messiah Creep: This aspect seems to have diminished starting with Season 7, mostly because the Ancients were revealed to have been incredibly Neglectful Precursors and less worthy of his idolation.
The reason the Ascended Ancients kicked him out was because he was too much The Messiah, not wishing to sit idle while he had the power to actively help people, which was against their rules.
Omniglot: Speaks twenty-three languages as of "1969". Adding Ancient and Unas makes twenty-five.
Parental Abandonment: 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.
They Killed Kenny Again: 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 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 Running Gag that some of the other characters (Jack) just stopped buying it.
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.
Written-In Infirmity: 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 Hollywood Healing in the process).
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 Applied Phlebotinum, usually 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 joined the Atlantis Expedition after SG-1 was cancelled. As of Stargate Universe, she has been given command of the Daedalus-class battlecruiser George Hammond. Appeared in more Stargate episodes than any other character.
Ace Pilot: Logged over a hundred hours in enemy airspace during the Gulf War.
Action Girl: Though normally the brains of the operation, when an asskicking is called for, Samantha is more than happy to supply it.
Badass Bookworm: 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"?
Cartwright Curse: Up until Pete Shanahan, every man that she became attracted to (except O'Neill) ended up dying a violent death. Two alternate Carters that married O'Neill suffered the same fate.
Empowered Badass Normal/Touched by Vorlons: 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.
Straw Feminist: 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 Atlantis, partly as a result of having a year left in her contract when SG-1 was cancelled.
Originally First Prime of Apophis, he defected to the Tau'ri after becoming disillusioned with the Goa'uld. He probably underwent the most Character Development 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 Spock Speak is his Catch Phrase, "Indeed."
Guns Akimbo: Starting in season 9 with P-90's, of all things—presumably he got bored with his signature staff weapon.
Semi-justified, in that he used the Staff Weapon up until the fall of the Goa'uld in Season 8, presumably as a Take That using their own weapons against them. Also, it was a weapon designed for intimidation over killing power.
Loophole Abuse: 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.
Scary Black Man: 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".
Skunk Stripe: 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.
The Stoic: 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.
Taking You with Me: 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 Oh Crap look from Qetesh before the whole room gets blasted apart.
Token Heroic Orc: 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.
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. His fate following the Ori conquest of his homeworld Langara is unknown.
The Atoner: 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 Heroic Sacrifice in order to save his planet.
What Happened to the Mouse?: 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?
Lieutenant Colonel Cameron "Shaft" Mitchell
Played By: Ben Browder
Replaced O'Neill as the leader of SG-1 for Seasons 9-10, which received the Fan Nickname "Fargate" (or sometimes "Starscape") due to the fact that he and Claudia Black were former 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.
Badass Normal: 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.
Improbable Age: 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.
My Greatest Failure: 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.
Nom de Guerre: As an F-302 pilot, had the callsign "Shaft" (short for "camshaft", a mechanical part that shares part of his name).
No Yay: Invoked often towards Ba'al, who is fond of expressing his attraction towards both her and Qetesh, the Goa'uld who formerly inhabited her.
Pirate Girl: Her first appearance in particular, where she steals the Prometheus.
Sixth Ranger: 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.
Original leader of Stargate Command. Was a Bait-and-Switch Tyrant in the first episode, but eventually became a Reasonable Authority Figure 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 Poorly Disguised Pilot for Stargate Atlantis, who was in turn soon replaced by Jack O'Neill.
Badass Grandpa: He has grandchildren and, when he goes into the field, he is badass.
Bait-and-Switch Tyrant: One of his first acts was to try to blow up an inhabited planet. It wasn't long before he was downright fluffy, though.
It's worth noting 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 rose to the challenge.
The Character Died with Him: Don Davis died of a heart attack a few years after retiring from the show, and Carter mentions in Atlantis' series finale that Hammond died the same way. Universe's USS George Hammond is named in his honor.
The Chains of Commanding: His more malicious acts (like the above mentioned planet bombing) were because he had orders and unlike Jack "I follow my orders."
Da Chief: General in command of Stargate Command and the ones the heroes answer to. Sitting behind a desk and saying "You Have 48 Hours" is mostly his role. Unusual for the role he doesn't worry about backlash from the President if he tweaks the rules.
A Father to His Men: "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'.
Papa Wolf: Often acts this in spades towards SG-1.
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.
Rank Up: Spent season 8 as the lieutenant general in charge of Homeworld Security, then retired.
Reasonable Authority Figure. George "You Have A Go" Hammond very rarely turns down requests from his team and when he does it's for very good reasons.
Time Travel for Fun and Profit: Forms a Brick Joke 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.
Major Dr. Janet Fraiser
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. Had a bridge dropped on her in the season 7 two-parter "Heroes." Was eventually succeeded by Dr. Carolyn Lam in Season 9.
Mama Bear: It's not a good idea to piss off someone who knows as much about pain as a doctor, especially one that knows how to use a gun.
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 Frasier was Cassandra's mother. Nirrti got a lot more cooperative after that.
Rank Up: 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.
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.
Spider-Sense: 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.
What, Exactly, Is His Job?: 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 Engaging Chevrons, he's also responsible for 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 Bad Future 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 came with the place when they bought it.
Major General Hank Landry
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.
And Starring: Beau Bridges was prefixed with "With" in the opening.
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).
Running Gag: 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.
Scarily Competent Tracker: 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.
Story Breaker Power: 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.
Talking to Himself: Michael Shanks voices several Asgard, including Thor, so whenever one of them and Daniel Jackson are talking to one another, it's an example of this. Lampshaded when speaking to Kvasir, Daniel dryly comments he misses Thor.
The Stoic: For a cute little Roswell Grey, he's very stoic.
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 hilarity to ensue in ways that are just too specific not to have been Thor's intent, at least to some degree.
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. 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.
Grumpy Old Man: Jacob isn't all that old but he sure can be grumpy sometimes.
Humanity Is Infectious: 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.
Jerk with a Heart of Gold: 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.
Not so Above It All: 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.
Sharing a Body: 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.
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. He was mortally wounded by Anubis's troops during the attack on Abydos, but Oma Desala helped him and the other Abydonians Ascend to a Higher Plane of Existence.
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. "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.
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 World War Three in "Full Alert," which needs no explanation.
What the Hell, Hero?: 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.
Played By: Jaye Davidson
The villain of the original 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 Sufficiently Advanced Alien 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.
The original Big Bad 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 several apparent returns from the dead, he was finally Killed For Real by the Eviler than Thou Replicators.
Ain't Too Proud to Beg: 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.)
Arch-Enemy: To SG-1, and has reasons to hate all them individually.
Beard of Evil: The "real" Apophis lacks one, but his alternate selves in "Point of View" and "Moebius" sport Goatees of Evil.
Big Bad: For the first and fourth seasons. The loss of his ships made him too weak to be the Big Bad for Season 2. He was in fact defeated and tortured by Sokar midway through Season 2; and Sokar would go on to be the Big Bad for Season 3.
Blade Below the Shoulder: 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.
Even Evil Has Loved Ones: He really seems to care for 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 Shifu, who he conceived for with the sole intention of having him as a future host.
Not Quite Dead: 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."
Royals Who Actually Do Something: 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.
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 Big Bad, 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 cooperated with the Tau'ri when it benefited him and followed a personal code of honor. However, by the seventh season, old age was catching up to him. He became increasingly senile and his Immortality Inducer was beginning to lose its effect on him. Ultimately, Replicator Carter killed him in season eight.
A God Am I: Downplayed. 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.
Noble Demon: He has made several positive influences during his reign, and generally keeps his promises (at least until he has trouble thinking straight anymore).
Pragmatic Villainy: Unlike 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.
Played By: David Palffy, George Dzhundza
Replaced Apophis as the series main Big Bad. 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 energy being, having Ascended and gained scientific knowledge on par with that of the Ancients. He was smarter, eviler and more Genre Savvy 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 even amongst the show's own characters. He differs from other Goa'ulds in that he doesn't simply want to be the supreme ruler of the universe. His goal is to annihilate every 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 Post Script Season involving the Ori plot arc).
A God Am I: As per Goa'uld tradition. Interestingly, he actually admits that defeating Daniel in the Season 6 finale was not his doing.
Big Bad: 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 Big Bad through season 8's "Threads".
Body Surf: 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.
Dark Lord on Life Support: 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 Body Surf between human hosts, which treated him like a disease and gradually broke down.
The Faceless: Sported the classic Black Cloak look, due to really being disembodied energy occupying a man-shaped forcefield body.
Faux Affably Evil: 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.
For the Evulz: Most notably when he destroys Abydos just because he can.
Genre Savvy: 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.
Hero Killer: 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.
Near Villain Victory: He was seconds away from wiping out all life in the galaxy before Oma made her decision.
Omnicidal Maniac: 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.
A Goa'uld System Lord introduced about halfway through the series total run. Although he never became the Big Bad, he was a consistent secondary villain, often opposing both SG-1 as well as the series current Big Bad, making him something of the series Starscream. Like Starscream in Transformers Animated, 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.
Ascended Extra: 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.
A God Am I: 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.
Affably Evil: 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' genre savviness.
Arch-Enemy: O'Neill hates him more than any other Goa'uld, though he's subtle about it. Ba'al seems to despise O'Neill in turn.
Brick Joke: A rather dark Continuity Nod. 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."
Belligerent Sexual Tension: a ton with Adria, despite their relatively limited interaction. Similar in many ways to the tension between Mal and Inara in Firefly, and thus possibly a deliberate reference. Gets a little strange, complicated, and maybe a little squicky when Ba'al 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.
Civilian Villain: Briefly set up shop as an Earth businessman after the Replicators ate all the other System Lords.
Crazy Enough to Work: 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.
Death Is Cheap: 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.
Emperor Scientist: 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 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.
Enemy Mine: 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.
Going Native: 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 Stargate Continuum, 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.
Power Parasite: Attempted to control Adria, and briefly succeeded until the intervention of SG-1.
Pragmatic Villainy: Ba'al wants to win, but win long term. Stargate Continuum 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 God Emperor thing...
He also, unlike most Goa'uld, actually seems to understand that the "A God Am I" 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.
Worthy Opponent: 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.
Hive Mind: Implied, though their exact workings aren't clear.
It Only Works Once: Thanks to 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.
Just a Machine: Daniel Jackson claims this makes them unable to comprehend Ancient knowledge.
Zerg Rush: 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 Dakka is about the only counter there is.
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 Big Bad.
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 leaving him and the others trapped by a Time Dilation device. Reappears in Season 8 seeking revenge.
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.
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 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 Big Bad 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 take over the universe (she fails, of course).
A God Am I: Like the Goa'uld, Adria actually believed herself to be a god, although perhaps more justifiably.
Tykebomb: Pretty much created expressly for the purpose of taking over the Milky Way.
What Could Have Been: Apparently, there were plans to make her more long-lasting, including having her fuse with a Goa'uld symbiote. However, plans fell through after Sci-Fi ended the series, and instead had her do a re-hash of Anubis's final plot.
The Goa'uld symbiote part actually happened in abbreviated form, resulting in Adria having to Ascend to a Higher Plane of Existence after a failed extraction attempt killed the symbiote but left her dying.
Younger than They Look: Actually only about a year old, grown to adulthood over the course of a few days via accelerated aging.
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.
Arc Villain: Acted as a recurring antagonist for part of season five between the death of Apophis and the rise of Anubis.
Thrown Out the Airlock: After the Goa'uld infesting Adrian Conrad jumped hosts to him in "Prometheus", he tried to kill O'Neill, who spaced him.
Senator Robert Kinsey
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".
Laser-Guided Karma: 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." He was even taken as a Goa'uld host, after all those years of saying the snakes were no real threat to earth.
No Party Given: Though fan theories make him Republican, given as he is prone to spouting an extremist style Christian fundamentalist ideology. On the other hand his "big government" attitude could alternately make him come across as a hard nosed Democrat.
Too Dumb to Live: 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.
What Happened to the Mouse?: 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 Villain Exit Stage Left using a handy nearby shuttlecraft.
Colonel Harry Maybourne
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.
Becoming the Mask: 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.
Emperor Scientist: 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.
The Good King: Though he gains the position through lies and deceit, he eventually shapes into this when he becomes king of a relatively primitive planet.
Harmless Freezing: 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.
Heel-Face Turn: After becoming a wanted man, he helps out O'Neill and is eventually smuggled off-world by the SGC.
Hidden Depths: After manipulating his way to the top of a primitive culture, he discovered he was actually a pretty capable ruler.
Vitriolic Best Buds: After a long period of antagonism, his later episodes with O'Neill began to veer towards this.
Well ... Jack seems to no longer harbour an uncontrollable urge to shoot him. At least not often.
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.
Evil Versus Evil: Besides having their own misguided way to fight the Goa'uld, at one point they tried to assassinate Senator Kinsey.
Laser-Guided Karma: 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.
Well-Intentioned Extremist: 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 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 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.