XSGCOM is a Crossover / Alternate Universe Fic with Stargate and Boxed CrookX-COM written by Hotpoint. It explores an alternate universe where humanity is actually better off than in either main universe. Instead of the Russians finding about the second stargate, X-COM retrieves it. After both organizations become known to each other, they are merged together. What follows is a clash between two factions, one Bad Ass Canadian, Earth moving to the offense and lots of dead Jaffa. The two settings involved are neatly tied together with, for example, Elerium being made from Naquadah, though the process involved is unknown to Earth. The author provides any necessary background info in his chapter notes, including hyperlinksnote Due to the nature of the site, the Fanfiction.net versions of the stories do not have the links.Contains two parts to date:1) XSGCOM: Goa'uld Defence (alternatively subtitled Mirror Image on FF.Net) follows events from the aftermath of the second stargate's retrieval to the finding of the Ancient Outpost in Antarctica.2) XSGCOM: Terra from the Deep follows the Atlantis Expedition and its war against Wraith and ongoing events in the Milky Way.Can be read here.Fanfiction.net link: here for Mirror Image, and Here for Terra From The Deep.Has a SpaceBattles thread which is sometimes more up-to-date than the other sites. e.g. As of 10/10/13, it's on Chapter 20, Parts One and Two.We have a page for Shout-Outs.
This fanfic provides examples of:
Actor Allusion: One chapter has Heimdall taking the place of Janet Frasier, both of whom have the same (voice) actress.
Elizibeth Weir is startled to find that Narim (a Tollan) and her fiance look nearly identical (again, same actor).
My Friends... and Zoidberg: Played Straight by O'Neil: "'We’ve got a few friends, basically decent folks like yourselves' he said. 'And we know the Aschen too'"
Area 51: Like in SG-1 becomes a site for research into alien tech. However due to stronger relations with the Asgard one of their researchers ends up working here resulting in regular pranking of new recruits. * For those who haven't seen the show, the Asgard are pretty much dead ringers for a Roswell Gray
Area 51 seems to attract a lot of aliens due to its nature and what they're studying- Nirrti is pretty much a Boxed Crook, and several humans from across the galaxy claimed asylum and work there on various tasks.
Armor Is Useless: Averted. Getting better armor has helped survival rates, and Kull are terrifying partly because they need multiple Heavy Plasma shots, THE biggest infantry gun around (Blaster Bombs are... a bit above infantry level), to kill, as well as the fact that they can punch through X-COM's cydonium/trinium armor just fine.
Ascended Extra: Lots of people. As just one example, Sharp was originally a throwaway reference in a manual.
Awakening the Sleeping Giant: After the Tau'ri give some advice to the Tollan, even Anubis keeps his distance. The Wraith learn the hard way that they don't want the Tollan in their galaxy.
Also what happens when X-COM blows up a quarter of the Wraith in the galaxy. Here come the Aquatoids...
The Aschen might be viewed as the Token Evil Teammate of the Alliance, but it is noted that they have the highest population of any human nation, and the second-highest tech level of the human nations as well (behind the Tollan, but they're ahead of other non-human nations as well). Due to a concentrated effort by the United Worlds, they're mostly kept to systems they control, but one of the last-ditch plans of the United Worlds is to give the Aschen Goa'uld hyperdrives (which are vastly superior to their own) and let them go on their enemies.
Ax-Crazy: Parodied. "When the guys in charge of X-COM think you’re too nuts to be on a UFO Retrieval Team, then you’ve got some serious issues."
Bad Ass: Anyone in X-COM. A large part of SG teams as well.
Bad Future: Why the Aschen are so willing to work with other races- in the original timeline, they released a Depopulation Bomb against Earth so that they could take the technology and Earth as a colony world. X-COM responded by sending the first of their BC-305 ships to the Aschen Homeworld with ZPM-enhancedAsgard weapons, and destroys a very large fraction of the planet. The Aschen used the time-travel glitch on the Stargate to send a message back in time to warn them against doing this: "Under no circumstances provoke X-COM." Also serves as a nice Continuity Nod to the SG-1 episodes "2010" and "2001."
Also, the Aschen. Even though they're part of the alliance, nobody trusts them and they aren't granted the same technological items that others are.
To paraphrase, "The Nox didn't like them, and the Nox liked everybody."
Brick Joke: Back in Chapter 8 of Daniel said that ‘the Cult of Osiris isn’t coming’. Guess what the foundations for have been laid in Chapter 37?
In Chapter 31 of Defense inhabitants of Jebanna were told about "Sharp of Canada". Guess who came in person in Chapter 1 of Terra?
A little girl who was listening to Maybourne the first time even comes up and brings up the "Hockey Stick" joke.
Way, way, way back in chapter one of Goa'uld Defense, an X-COM member states that if X-COM was a company, he would buy stock in it. By Terra From The Deep, X-COM has founded their own company called MarSec, which sells X-COM tech to Earth's offworld allies.
Samantha Carter mentions that she would need to see evidence of psionics in a carefully controlled laboratory situations before she believed it. By the end of Goa'uld Defense, Samantha was the first to witness Cassie actually lifting chess pieces with her mind.
Bunny-Ears Lawyer: Andianov comments that O'Neill is the most inexplicably effective commanding officer she has ever had, after he came up with the idea of publicly humiliating the Goa'uld to ruin their image as an excuse for playing practical jokes on them.
But I Can't Be Pregnant!: Doctor Frasier and Commander Sharp are quite surprised to learn that sarcopghus can fix a vasectomy...
Call a Rabbit a "Smeerp": "Like the Casa Gruel in the story of Draxius Kol and the Three Unas?" Though this one came first and the names were changed when it got to Earth, making it not quite a straight usenote For those who didn't get it, it's Goldilocks and the Three Bears..
Car Fu: The first Kull Warrior is taken out partly by a hovertank running it over.
Chronic Backstabbing Disorder: A common problem with Goa'uld alliances but taken to its extreme during the massive battle between Apophis and Anubis when Ba'al, Ameterasu, Bastet and Kali all immediately betray Anubis and start attacking him after Apophis' flagship is taken out
Chunky Salsa Rule: Once X-COM starts making its own Sarcophagi, this is one of the few things that you can't be brought back from.
Cool Ship: While the upgrades that the author makes to canon ships are quite impressive, the BC-305 in an alternate timeline where the Aschen wiped out a fair portion of Earth's population bears special mention: Zero Point Module enhanced, Asgard supplied weapons are the only mentioned weapon that these things have, but knowing X-COM, it probably has way more. The rest of the Tau'ri fleet is stated to be off in another galaxy, fighting the Ori.
The Tollan "Ghostrider" ships are particularly impressive, with Asgard Shields and Hyperdrives, as well as their own Ion Cannon weaponry, phaseing technology, and UFT bombs capable of cracking a planet in half.
The United Galaxies Ship Arthur Pendragon, the one of it's kind X-306 class Dreadnought from the upcoming XSGCOM: Multiverse. 1.75 Kilometres from stern to bow, 65 million tonnes of mass, the ship features an Arcturus Reactornote Based on the abandoned Project Arcturus, four Zero Point Modules, 12 Neutrino Ion Generators and 24 Mark IV Naquadah Reactors for power generation, a Lantean Wormhole Drive, an Asgard Intergalactic Hyperdrive, a Graviton Pulse Drivenote For sub-light propulsion, a Time Jumper Drive and an Alternate Reality Drive. The ship is built around a Lantean Particle Cannonnote The kind found in the Lantean Defence Satellite and has two Ori Energy Beam Weapons, four "Ripper" Heavy Staff Gatling Cannons, four Tollan Heavy Ion Cannons, eight Asgard Plasma Beam Weapons, 16 Ori Pulse Weapons, 36 Railguns, 48 X-COM Laser Cannons, 48 X-COM Phaser Cannons, four Ancient Drone Launchersnote 500 drones each, four VLS missile batteriesnote 100 missiles each, armed with Mark VIII 1.2GT warheads, 16 Horizon Missilesnote 6 x Mark IX 800 GT warheads, eight Tollan "Chicxulub" Class Phasing Bombsnote 100 Teraton Yield, four Tollan "Serita" Class Phasing Bombsnote 100 Petaton Yield and two Tainted ZPM Warheadsnote For taking out stellar systems for further armaments. It also sports improved Asgard Shields as well as a Lantean City Ship class shield and has a hull made of laminate of Kull-Warrior Armour weave, Trinium/Cydonium alloy, Aqua-Plastics and mono-molecular fibre mesh. Additional systems include a Lantean Cloaking Device, Tollan Phase-Shifting Device as well as Asgard Transporter Beams.
Crazy-Prepared: the X-COM operated Omega Site. The Stargate protected by both a force field and an iris, preventing people from coming through. The Omega Site is not on the main Stargate Network, so you can only get their if you know how to dial the Tollan-designed Stargate. The Stargate itself is in a pit that rises up to ground level once scanners have confirmed that you are, in fact, who you say you are. Finally, the top of the pit can be sealed with a force field so that X-COM can drop grenades, boiling liquid, or heavier-than-air nerve gas on you.
Creating Life: Out of all the protagonist species in the story so far, only a few are not stated to not have been created by another life form: The Nox, Unas, the Ancients (and by that extension, the Ori), Goa'uld, the Serrikin, and the Aquatoids. The Ancients created the Pegasus Replicators and the human race, which created Reese and the Replicators, while the Aquatoids made the Ohnes, Gadmeer, the Wraith, and the Asgard. The Sectoids were created by Loki, an Asgard.
Curb-Stomp Battle: Until Anubis arrives this is pretty much how every ground battle between the Goa'uld and X-COM goes. Subverted against Loki and the Sectoids. Just when you think humans are getting the upper hand, there is something new.
Standard Goa'uld forces still get stomped pretty hard by X-COM, despite the fact that they are advancing. The problem, though, is that for Jaffa forces, a "Major Advance" is using horse-drawn staff cannons to quickly relocate their artillery. For X-COM, a "Major Advance," involves Power Armor with enough firepower to level a continent.
In a Bad Future, the Aschen are the subject of one when they unleash a plague on Earth. They are soon visited by the BC-305, an Earth ship with ZPM-powered Asgard weapons.
Dangerously Genre Savvy: Pretty much the reason why X-COM keeps kicking so much ass. See More Dakka. The Kull also show this by headshotting any downed troops nearby so a sarcophagus can't resurrect them.
Death Is Cheap: Well, at least after they figure out how to operate and build sarcophagi.
And even then it's more like "Death is Cheaper," as there are some things the sarcophagus cannot bring you back from- headshots, total vaporization, or enough damage, and even the near-magical device can't bring you back.
There are also other flaws in the sarcophagus design- if you use it too much, too often, you will begin to show signs of sanity slippage (and consider how marginal the sanity of most X-COM troops is to begin with), which at times makes helping people more difficult. They nearly let Egeria die because of the fear of what such prolonged exposure to the sarcophagus would do to her. Also, Sarcophagi are really expensive to build.
Death World: Parodied when Canada is described as one. ‘They say [Sharp's] homeland is a frozen wasteland where the icy wind would cut you to the bone and where water only ever falls as snow, like it does here upon the mountaintops yonder... It is said the forests there are full of ferocious beasts with huge teeth and claws called bears, and that you must prove yourself worthy by defeating one with a traditional weapon of his tribe they call a hockey stick’
Everyone Has Standards: When the Nox, Perfect Pacifist People who look like a troll doll fused with a nature spirit and who ultimately believe in the good of all races, don't like you, you have some serious problems. Note that the Aschen fall into this, but then again, no one likes the Aschen.
Evil Lawyer Joke: Some of the Tollan remark that they have similar opinion of Lawyers on their world (called "Archons"), and relate a story about two Unas. "One came upon the other, who was eating dung. 'Why are you doing that?' asked the first. 'I just ate an archon, and I'm trying to get the taste out of my mouth,' says the second."
Evil vs. Evil: Anubis vs. Apophis, Loki vs. The Replicators, Loki and Anubis vs. The Replicators, Loki vs. Apophis, and given how fluid the situation in the Milky Way is becoming, these are all likely to go into the blender and hit "Liquify," relatively quickly.
It's implied in the future that the Aschen will be extremely helpful in the fight against the Ori.
Part of X-COM and the Alliance's strategy for beating the Goa'uld involves keeping them fighting each other until the Alliance is strong enough to handle them on their own.
Weir: 'You mean other than me trying to explain to the UN and the IOA that not only have I gotten us involved in another major war as an official ally of the High Council of the System Lords but that somehow I've accidentally turned Earth into an imperial power that rules over a quarter-million stars?'
Forgotten Superweapon: Subverted and averted. If the Stargate 'verse has left something behind, then the author usually comes along with X-COM teams to pick it back up, brush it off, reverse engineer it, and make the humans even meaner. Case in point? They start reverse engineering Sarcophogi as soon as they can, for starters...
For the Evulz: It's commented on that this is pretty much the only reason Anubis does anything.
From Bad to Worse: Enhanced by Stargate tech, X-COM starts winning battles. Then, the Sectoids get a massive power boost. While Earth is adjusting to that, Apophis and Anubis start showing up and unifying the System Lords. Once Apophis is gone, the Replicators start to show up, while Loki's Sectoid forces grow more advanced. While the Wraith are pushovers, the Aquatoids that show up are known to capture people and use their parts as pieces of their ships and organic technology. All while Earth is just barely keeping up with the influx of enemies and technology. The worst is still yet to come, though, as the biggest baddies in the Stargate series, the Ori, haven't even shown up yet but are still on the horizon. The whole series is like one big struggle between Lensman Arms Race and From Bad to Worse, with the race making things better, while the worsening seeks to keep how bad things are in stasis, good-bad wise.
Things do get better on the Sectiod front once they get the Enterprise culminating in them driving Loki out of the Solar System.
Then improved upon when they decide to make the "Rippers." These are six staff cannons arranged in a similar manner.
Then gatling plasma repeaters, the ones the Kull use, and gatling shotguns!
Genre Savvy: Earth, but Ba'al has some as well. He does have a policy of promoting underlings based on competence, rather than sycophancy, but he does note "That Sycophancy is still expected."
Godzilla Threshold: The Tau'ri have some... decisive last-ditch "fuck yous" planned if things really go wrong. Things like strategic WMD on Goa'uld worlds and letting the Aschen get their hands on hyperdrives. They also hope that the Tollan will introduce the Goa'uld to UFT bombs.
Gondor Calls for Aid: In Chapter 48 Langaran goverments request help from Earth to fight against Loki's invasion. Earth forwards message to Optricans, Pangar, Tagrea, Orban, Tollan... pretty much every human world that can help as well as Asgard. It sets up major Moment of Awesome when they all appear to help.
Happens on a much smaller scale in Terra From the Deep when one planet is attacked by Wraith riding party. The villagers send some volunteers to contact Terrans but don't really think that Terrans can do anything about Wraith. Only to be shocked when XCOM arrives and after an extremely one-sided fight make the Wraith flee.
Gravity Is a Harsh Mistress: One of the things done with transporters is beaming Sectoid engines out of their craft, resulting in them doing Wile E. Coyote impressions. This is actually known as the Wile E. Coyote maneuver.
Half-Human Hybrid: Parodied with O'Neill making a joke about Earth demanding child support for the Sectoids.
X-COM and Alliance forces start getting their own taste of it once Apophis starts outfitting his troops with zat-proof armor, staff rifles, gate-travel capable vehicles, and tactics clearly inspired by the successes that the Tau'ri/X-COM/SGC have enjoyed. It was predicted In-Universe many chapters back.
To a much lesser degree, Loki, as it's his technology that's given X-COM such a huge boost in technological ability. He openly states in Terra From The Deep that the reason why he's bringing the Type 4 fighters into production when the Type 3 were capable of curbstomping the most advanced human fighters is because "If I do not maintain such a large technological gap, I fear one day I will wake up strapped to a table facing smiling scientists with scalpels and mind probes."
The Goa'uld System Lords are offered the choice between fighting against Ba'al alone, or fighting against the Replicators. One of them remarks that she can see herself coexisting with the freaking Replicators much more easily than Russel Sharpe and X-COM.
Hollywood Tactics: Subverted by the Goa'uld as time goes by, with them learning to use supporting fire and ambushes more effectively. Several characters lament this.
Played straight with the "Tok'ra emulating Chow Yun Fat" example below. "It was hard to tell who was more surprised, the Tok'ra or the Jaffa."
Humanity Is Infectious: Parodied when a Tok'ra agent infamously does a Chow Yun Fat impression on a squadful of Jaffa. 'Tau’ri culture was insidious like that, it rubbed off on you, totally shifted the way you looked at the universe and made you try things you wouldn't have dreamt of before.'
If I Wanted You Dead...: An initial argument against the Asgard and Sectoids being the same was that the latter would not have to come down to Terra and use infantry if they had the former's tech. In a later, separate incident...
"Commander, according to the results of the investigation you agreed to while under the za'tarc detector you were more annoyed at the implication that if you had been responsible there would have been any live witnesses left behind than you were the accusation you were guilty of carrying out the attack."
"I objected to the implication I'm some kind of blundering amateur."
Implacable Man: Kull Warriors are still tough nuts even with X-COM armour and weapons.
I Need a Freaking Drink: O'Neill has this reaction when he finds out that Loki is offering to ally with Earth to fight the Replicators.
In Spite of a Nail: Some things like Fifth being left behind with the other human-form Replicators or Anubis getting all the Eyes for his superweapon and destroying Abydos still occur despite the changes.
Daniel Jackson dying and ascending, though, is justified: even though in this timeline they have access to a sarcophagus (two, in fact), both are being used to revive X-COM personnel who died on a recent mission. He decides to ascend before they can stick him in one, though.
"It can't be true" Weir said to herself quietly, "we can't just be the leftover war-toys of some precursor civilization" she tried to convince herself before a thought occurred and she suddenly stood up and thumped her clenched fists down on the conference table. "I refuse to accept that Russell Sharp is a first class representative of what we were intended to be!" she shouted out into the universe before collapsing back into her chair, her eyes glassing over as she considered the bleakness of creation.
It Never Gets Any Easier: Inverted with Andianov after Daniel's ascension. As others note, being X-COM for so long had neutered her to the realities of their high casualty rates and getting seconded to SG-1 has, in her own opinion, made her weak again, though said others see it as a sign of regaining humanity. She thinks they're the same thing.
Lampshade Hanging: In chapter 22 of Goa'uld Defense/Mirror Image, Sharpe notes that a lot of the worlds in the galaxy look like his home country of Canada. The show is produced in British Colombia and Vancouver, which leads to the city's nickname as Stargate City.
LEGO Genetics: Sectoids are actually a mash of Asgard and other races' DNA.
The Wraith are a fusion of Alteran/Lantean DNA and Iratus Bug DNA, created by the Aquatoids to overcome their own lack of psionics.
Lensman Arms Race: Earth starts at the bottom of the food chain. By the start of the second story, the Goa'uld actually agree to human domination of part of the galaxy just to get Earth's weapons pointed at Ba'al instead of themselves.
Logical Weakness: Those who have Naquadah injected into their bloodstream (to be able to use Goa'uld healing devices) will set off metal detectors at the airport.
Most of X-COM's arsenal doesn't work well underwater, because they largely rely on lasers or plasma, which would either simply not work or would be too scattered by the water to be anything better than short-range ones. When they start facing the Aquatoids, the Atlantis Expedition has to either rely on Ancient Drone Weapons (which were originally designed to deal with Aquatoids), or develop entirely new avenues of weapons research, such as rocket torpedoes and coilguns.
Magnetic Weapons: The Gauss weapons from the original Terror have been turned into coilguns.
The Man Behind the Man: The Aquatoids to the Wraith. Also Loki to the Sectoids, but that's revealed fairly early on.
To a much lesser extent, the Ancients to the humans.
Anubis wants to be this to Ba'al, but has thus far failed to understand exactly what makes Ba'al tick.
Meaningful Rename: Earth(Terra) was renamed after Ancients conquered it. Before that, it was called Water(Aqua) by Aquatoids
Mercy Kill: Sharp had to euthanize a young girl who was abducted by aliens.
Played more for laughs when Rodney kills Shepard in order to save him from an Irratus bug. They do bring Shepard back with a Sarcophagus.
Me's a Crowd: Weir gets her past self, who dies in original timeline, brought back to her. 2nd one serve as a Morality Pet for the present battle hardened one. Also Carter. Right now, there are total of three different Carters running around the Milky Waynote The human one, the android, and Replicarter..
Not to mention the other android duplicates of SG-1: RobO'Neill, Androidinov, Robot Daniel, and Robot Teal'c.
Mêlée à Trois: The Battle of Abydos turns into one of these when Apophis shows up and starts fighting Anubis and the Tau'ri for the Eye of Ra.
Mooks: Series begins with X-COM slaughtering a group of Jaffa. It only goes downhill for the Jaffa from there...
The Jaffa start getting better once they start adopting tactics from X-COM, including using artillery, modifying their staff weapons into staff-rifles, and investing in better armor. Of course, by this time X-COM's weapons, armor, and tactics have improved to such a degree that it's almost "Too little, too late." The Free Jaffa, on the other hand, find that adopting X-COM tactics will allow them much easier victories over Goa'uld Jaffa, so the trope is kinda zig-zagged.
In the main series, Wraith were considered terrifying opponents who took many rounds of ammo to kill, and could easily overwhelm their opponents. In this universe, one person is startled by a Wraith, then admits that she was scared for a moment, then blows off the Wraith Queen's leg with a plasma pistol.
Moral Myopia: Loki is fully convinced that the Asgard will welcome him back after he solves the problem with their cloning, regardless of the cost to humans and other experimented-on species. Anubis thinks he's deluded.
More Dakka: Gatling Staff first, later Gatling Staff Cannon.
The Mk. II Power Armor also counts, as it has Gatling Plasma Repeaters as well as a number of other weapons.
In the games, the Aquatoids created the Sectoids. In the story, Loki created the Sectoids, so at first it looks like that piece of continuity is thrown out. However, in Terra, it is revealed that the Aquatoids created the proto-Asgard, which gave rise to the Asgard proper, including Loki. So in a roundabout way, the Aquatoids still created the Sectoids.
Neutral No Longer: The Tollan are more or less starting to leave their isolation when faced with all the cruelty other humans are suffering.
Nice Job Fixing It, Villain: When Anubis sends the Naquadah asteroid, XSGCOM easily move it out of the solar system and starts mining it. This solves all their naquadah related needs in the future. Lampshaded by Commander Sharp, "Someone remind me to send a note of thanks to the dumbshit that gave it to us."
No Good Deed Goes Unpunished: Said word for word by Sharp; it was because the SGC defeated Apophis' attack on Earth that Loki began to step up his operations.
No Sell: Cassie's psychic power is clean off the charts. X-COM and SGC troops whose psychic resistance is itself enough to No SellMind Control from other aliens are still hapless before her.
Not Quite Dead: Thanks to Goa'uld sarcophagi some - but not all - previous writeoffs can be brought back to life. They can't bring back those who have been headshotted or are subject to the Chunky Salsa Rule. Also, the Earth-made sarcophagi are expensive, and there aren't that many of them. It's still possible to die permanently while waiting for one of them to be freed up for your use.
Normal Fish in a Tiny Pond: How X-COM feels in the war against the Wraith, Aquatoids, and the Goa'uld. X-COM soldiers are so used to fighting Sectoid forces, which are far more powerful, durable, and dangerous in every conceivable way than ninety percent of the alien races encountered, that fighting against Jaffa is considered a vacation for them. Sharpe even feels guilty because he's stuck fighting the war against the Goa'uld, when he knows that his skills would be better suited to fighting the war against the Sectoids, which needs far more men and weapons.
Not So Different: "Lacking the disposable cannon-fodder of many worlds with a large population of Jaffa upon them Anubis was always forced to seek force-multipliers, in this way he was strangely similar to the Tau’ri he now found himself in opposition to, they both constantly sought a technological means to make up for their numerical shortcomings."
This is also one of Earth's best methods of diplomacy: they exchange lawyer jokes as well as spices and chocolate with the Tollan, for one example. Jack O'Neill claims this when Loki attacks Langara, saying that "If you attack one of the United Worlds, you attack all of us."
During the construction of the Alpha Site, Sharpe mentions that he regrets that the base couldn't be inside a volcano with liquid hot magma. Later, Anubis becomes furious not only because Sharpe destroyed his base, but because "they had no understanding of just how difficult it really was to build a base in a hollowed out volcano surrounded by liquid hot magma."
Also rebutted by Andianov when Elizabeth asks this of X-COM: ‘We do bad things for a good cause. They do them for a bad one. If you cannot grasp the distinction then your intellect is vastly overrated.’
Nuke 'Em: X-COM standard procedure, to the point that Elizabeth Weir feels the need to point out that they are not the only way to handle problems in the Pegasus Galaxy.
Oh Crap: Basic reaction of Jaffa when X-COM appears.
Old-School Dogfight: Interceptions become this due to the stealth and ECM of Sectoid fighters making missile lock very difficult.
Portal Network: Given that it's based on the Stargate Verse, this was inevitable, but a unique twist in that since diplomacy went much better with the Tollan this time around, the Tollan now supply planets with their own Stargates which can be effectively "off the grid," from the rest of the network. So it's like two semi-separate portal networks that can connect when one wants to.
In Terra From the Deep, Shepard points out that due to a flaw in the Stargate's programming, the Ancients could have simply shut down all the gates in the galaxy before turning on the Attero Device, which would have caused far more death to the Wraith. This causes Janus to have a Heroic BSOD.
To a much lesser extent, the Aschen Teleportation Platforms. They aren't used as much, though they do require at least two platforms.
Prolonged Prologue: technically, to the Ancients who created mankind, most of human history (if not the first story) is one, since Mankind was modified by them in large part due to their desire to defeat the Wraith, Aquatoids, and the Ori. While beating seven kinds of hell out of the Goa'uld is a good thing, humans don't start on the Wraith until the start of "Terra From The Deep," while the Aquatoids don't show up until much later in the story, and the Ori haven't shown up yet (but Word of God says that they appear in the third story.)
Protagonist-Centered Morality: Averted. The Aschen still aren't trusted, despite being arguably the most powerful human nation in the Milky Way galaxy. X-COM gets yelled at a lot for their "extreme" methods, and several diplomatic summits only take place under the condition that Russel Sharp is nowhere within a thousand light years of the meeting.
Time-Clone Elizabeth Wier takes pleasure in pointing out how far her present self has slid, morality-wise.
Many of the Athosians from "Terra From The Deep," think that humans from Earth are insane. When it comes to light that the Satedans were another Alteran/Lantean/Ancient genetic project with the same genetic upgrades and proclavity for violence that the humans of Earth were given, they are not surprised in the least.
The Jaffa... which is a source of humor for X-COM in that the Goa'uld picked perhaps the worst possible candidate to modify and give super strength, extended lifespan, and the capability to incubate their young. Then again, it's also a source of humor at how this attitude is averted in how easy it is for the flexible, modern tactics of X-COM (not to mention superior technology)to slaughter Jaffa in the thousands.
Redemption Equals Death: Parodied with Jonas. ‘You know you’ve more than redeemed yourself for anything you did, or didn’t do, regarding Danny since you joined the SGC... Hell you’ve died for the cause, only temporarily but you did die... hard to top that in the earning redemption stakes.’
Redshirt Army: Though the onscreen focus is largely on the successful missions, there's plenty of reference to how the other alien war costs a lot of X-COM men and materiel, and they're well aware of that. The author throws out the "crappy recruits" idea from game mechanics in favor of the view that the SF troops seconded to X-COM really are elite forces... the aliens are just much better. The ones in Sectoid service at least.
The Jaffa play this trope much straighter.
The Wraith are... much less of a threat then they were in canon, thanks to the advanced alien technologies X-COM now has access to. Case in point? The Battle of Atlantis was, in canon, a desperate struggle for survival, where Atlantis just barely held on because of trickery, Lantean Drones, and the Daedelus, and they still had to make the Wraith believe they were dead to end the battle. In XSGCOM? Most of the Wraith Fleet that attacks is annihilated thanks to the combined efforts of AG-3X satelites, Earth's starships, a Lantean weapon platform, and much, much more.
Shoot the Messenger: Lampshaded by Apophis, who realizes that while killing the bearer of bad news is very cathartic, it's not good policy (especially with the war on). That being said, he is very tempted once word reaches him that Anubis has joined the fight.
Shown Their Work: Every chapter (except the first few) shows where he's getting every plot twist, from every game and/or episode in the author's note at the end of the chapter. Even if it's an original idea, he shows how the idea could possibly work if derived from the source materials.
This is something of a trademark for the Author, who did the same thing with Hunted Tribes and its spinoff, But Somehow A Most Melancholy.
Space Battle: It's a crossover between X-COM and Stargate. Yes, there are space battles.
Of note is the final battle between Apophis and Anubis, which according to the Tok'Ra, involved two thirds of all Ha'tak-class vessels in the galaxy.
Or the Battle of Atlantis, which had well over a dozen hives.
Spared by the Adaptation: Various characters including android SG-1, Janet Frasier, Alternate Timeline Doctor Weir, Replicator Fifth, the android Reese, Goa'uld Nirrti, Tok'Ra queen Egeria, and even background characters have been stated to survive where their canon counterparts have not.
More for the list, Civilization time! The civilizations of Rand and Calledonia (of Tegalus), the Aschen (though their fate in the canon timeline was never all that clear to begin with), the Tollan, Ernest Littlefield, and Catherine Langford all survive. Colonel Vaselov, the original military leader of the Atlantis Expedition, also survives.
Apophis... sort of. While, due to X-COM not lending the Tok'Ra their Ha'Tak, Apophis didn't die the way he was supposed to in this timeline; he dies later, in battle against Anubis.
Though it hasn't happened yet, it looks like Carson Becket might survive, as Janus disposed of the "Exploding Tumor" machine that killed him in canon.
Springtime for Hitler: While negotiating with the Goa'uld System Lords, Weir wants to avoid going to war with Ba'al, so she tries to make a request that they will refuse by demanding that the Goa'uld cede them every star system within two and hundred and fifty light-years of Earth. They go for it, and Earth inadvertently becomes an interstellar empire.
Stab the Scorpion: At one point Andianov appears to be shooting at Teal'c. Turns out that she intercepted a Goa'uld symbiote's attack.
Super Serum: X-COM troops take a cocktail of drugs to boost their performance, aware that there will probably be long-term effects but believing the short-term benefits are worth it and that their likelihood of surviving the time needed for the side effects to kick in are... poor.
By the time of Terra From The Deep, X-COM is working to add in Wraith Serum as part of a "Berserker Pack."
Super Soldier: Even the basic Sectoid trooper is genetically engineered to a level that X-COM troops have trouble with, never mind the more elite enemies.
As it turns out, humanity by the Ancients.
Also, the Anubis' Kull Warriors.
In theory, the Jaffa. They fit most of the criteria: live longer, better immune system, heals better, stronger than an average human, etc. In practice, however, their inflexability, poor weapon design, awful tactics, and insane leaders make them little more than mooks to X-COM and other human forces.
Super Reflexes: Andianov. It is considered inhuman by other characters in the story and superb even by X-COM's high standards.
Take That: occasionally, the narrative will lampshade some of the events of canon, such as the silliness of the Prometheus taking off during the day, despite the fact that it's a giant spaceship launching from an area already under surveillance from UFO watchers.
‘One of those Star Trek novels?’ O’Neill queried, it still made him grin that a man born on another planet with an alien larvae living in his guts was a sci-fi fan. ‘Yes thank you O’Neill’ Teal’c replied, ‘none of those written by Shatner’ he requested, ‘in hindsight purchasing them was a grievous mistake’ he said sadly.
Janus disassembles the "Exploding Tumor Machine," claiming that it was incredibly dumb. SGA-1 also tells the Hoffans that their plan to become inedible to the Wraith will only make it more likely that they'll be wiped out by their enemies, not less, using the analogy of a farmer exterminating a cow that has "Mad Cow Disease."
Tank Goodness: The hovertanks, including the first one, which SG-1 names "Harvey."
"The Jaffa were slightly confused at the Tau'ri battlecry of "Sic 'em Harvey" but they didn't have much time to ponder the meaning of the phrase before a large, floating machine, utterly impervious to their weapons appeared in their midst spitting a continual stream of laser and plasma fire and the situation became very unpleasant for them indeed."
Nirrti, a Goa'uld only kept alive because she's so useful to X-COM.
O'Neill considers Maybourne this. In the same way, many members of the SGC consider X-COM this, given their willingness to do less than ethically sound or sane things.
Many, many, many people and civilizations consider X-COM this. Even Stargate Command doesn't really like them all that much, and mostly goes along with them in order to make sure that they don't piss off all of their offworld allies. It doesn't always work, as at least one diplomatic conference was only convened under the reassurance that "Russel Sharpe is nowhere within a thousand light years" of the event.
Training from Hell: X-COM training. Even if you are Elite of Elite, you are still put through training that would be considered inhuman by many. Worst part? You are going to need it. After some of the technology starts filtering back to Earth, it gets worse. Recruits are shot repeatedly with Zat guns so they can build up an immunity to the shots, intars allow for more realistic live-fire exercises, and the memory devices recovered later allow memories from back before all the good alien hunting tech was used to be planted into rookies (when casualty rates were far, far worse.)
And it keeps getting worse as time goes on and more tech is recovered.
Tempting Fate: In chapter 13 of Mirror Image/Goa'uld Defence, O'Neill and Daniel are making jokes as to who is most likely to win the "Evil Asshole of the Galaxy 2001 Award," with the two front runners being Apophis and Loki. Carter comments that there's little chance of another person coming in to take the title. The very next paragraph is the introduction to Stargate's greatest Manipulative Bastard, Ba'al, who is working for an even worse monster, Anubis.
Totally Radical: "There’s a passage over there which says Ra is a righteous dude and Anubis is bogus."
Sharp uses "bitchin," when shown the Mark II Powered Armour, later blaming Cassie for it.
Twin Threesome Fantasy: "The O'Neill's didn't simultaneously have the same thought about what they'd like to do with three Samantha Carter's in an ideal universe, but only because the mechanical Jack O'Neill had a brain that got there quicker."
Uncanny Valley[invoked]: The Athosians have this reaction to the Terrans, specifically their "Craziness," their willingness to use violence, and their psionic powers.
We Have Reserves: The X-COM mindset, which is one reason for the friction between them and SGC.
Weak, but Skilled: Deconstructed when the weapons on Thor's Beliskner turn out to not have enough power to overcome Anubis's new shields that are also immune to the shield-piercing effect. Played straight with the Seritans, who have no major capital ships, but rely on small, fast, powerful fighters. Loki's forces are viewed this way by the rest of the Goa'uld, in a manner similar to the Seritans.
X-COM, in a sense, at least towards the beginning. Even without technological equivalence to the System Lords, X-COM soldiers are far superior to Jaffa Armies, despite the crushing advantage of technology, numbers, and FTL-capable starships. Later averted once X-COM starts getting its own starships, and the tech advantage begins to heavily favor Earth's forces. Still played straight in other areas- Earth, like in canon, is forced to "Punch Above Its Weight" in order to stay in the game, and while they are in a much improved spot than in canon, a Goa'uld fleet is still capable of doing massive damage to the planet.
This includes Human Aliens like the Tollan, Langarans, Tegalans, and Athosians, not just for nonhumans like the Sectoids, Asgard, or Goa'uld. This has caused friction between X-COM and Stargate Command at times, particularly since Andianov was originally assigned to SG-1 in order to watch over (and kill) Teal'c if he ever decides to betray them.
It's also caused friction between Earth and its allies before. It's noted early on that several treaties were only signed because they had a guarantee that X-COM wasn't within a thousand light years of the signing.
Weir: Nuclear weapons are not my preferred solution to every problem we ever encounter in the Pegasus Galaxy.
McKay: But we've done so well with them so far.
Wild Card: Ba'al. He's willing to temporarily ally with the Tok'ra because he knows that a single incredibly powerful system lord would be a greater threat to him. To this end, he also backs Anubis against Apophis, but betrays the former the second the latter is dead.
Willfully Weak: Justified for Loki, who can't use full Asgard tech lest his kin come down on him. Not that his troops aren't nasty enough without it.
It's also implied that the deliberately low levels of technology were to help fight off the Replicators, who would attack high tech devices and make themselves stronger. By using low tech devices, he could surprise them.
Word of God: The author has stated that he's trying to make a galaxy that is able to fight off the Ori on their own, without relying on Dei Ex Machina from ascended beings as they did in canon. Example: he's gone on record as stating that instead of relying on ancient space magic to cure the Prior Plagues that the Ori used to destabilize the galaxy, the Aschen, masters of biological warfare, will be able to help counteract this severely.
Apparently, there will be a third story in the XSGCOM series, but the title is unknown. It will apparently deal with the Ori invasion of the galaxy. The primary evidence for this is in the chapter notes of "Terra From the Deep" chapter 19.