The Z.O.E. from Ace Combat 2 and its Updated Re-releaseAce Combat: Assault Horizon Legacy is an enemy that shows up every now and then just to fight the player - it's so aggressive (being the only enemy in the entire game to chase down the player from the start of a mission) that many players are even unaware the game has a different ending for not shooting it down at every opportunity. Assault Horizon Legacy gives more context and dialogue to the story, which leads the rebel Cocoon Squadron to wonder if it'd be possible to recruit such a formidable ally, and your own Commander Olsen wondering out loud just what the heck this thing is. He states that there's no way the rebels would've developed such advanced technology during the final encounter, and there are ultimately no answers. "Z.O.E" is only revealed to stand for "Zone Of Endless" for the player's sake. Even knowledge of outside material doesn't reveal much more, other than that the plane it's using for the final encounter is Belkan technology; what it's doing halfway across the world goes unexplained, not even the typical "Belkan infiltrators are fanning the flames of war" every game in the series since 5 has boiled down to.
Almost all races in Age of Wonders: Planetfall were a former part of the Star Union prior to its collapse. Even the insectoid Kir'ko were a part of it (an enslaved part, but still) and the newly-arrived Psi-Fish are passive and low in number. So the arrival of the Shakarn, a race of genuinely alien Lizard Folk who favour the Reptilian Conspiracy, catches everyone completely off-guard.
You barely have time to sleep after defeating the Big Bad in the first game that Baldur's Gate: Siege of Dragonspear throws at you the crusade of Caelar Argent and an attempt to your life. Time to warm up and prepare your best gear.
You start Baldur's Gate II captured by a mysterious wizard whose motives and identity are unknown. The intro sequence only shows that somehow he was already aiming at you since time, waiting for the right time to strike.
Again, you barely have time to sleep after defeating the Big Bad, that now the Five in Throne of Bhaal suddenly start rampaging the continent, unleashing their armies to wreak havoc and looking for you.
The Joker comes across as this in Batman: Arkham Origins. He arrives in town with no explanation, no origin, no identity, no real motives, just wanton and senseless destruction. Batman himself is completely taken aback by the sheer brutality and sadism in the crime scene where he first sees his name and later mentions that while he's put away psychopaths before, The Joker is something completely different.
To an extent, Scarecrow and the Arkham Knight's militia in Batman: Arkham Knight. The police were completely unprepared for an actual army bristling with high-tech equipment to march right in and seize control of Gotham, and even Batman's Crazy Preparedness is put to the test, especially when the Arkham Knight seems to know everything about Batman's tactics because he's actually Jason Todd, who Batman thought was long dead.
The BlazBlue series has Yuuki Terumi, Relius Clover, and Izanami playing a game of destiny against Rachel Alucard, Kokonoe and the Origin/Amaterasu, and yet even with chessmaster-on-chessmaster action in full play, a few of these are introduced in the story, each further out of context than the last.
Makoto Nanaya downplays this trope in a manner of speaking, as she makes sense in context for the most part: she's someone who has legitimate connections with the known cast and well-established relationships along those lines. However, in the Slight Hope story of BlazBlue: Continuum Shift, this instance of Makoto is out of context with this particular timeline, having been displaced from her own thanks to the Cauldron in Ibukido. Terumi's plans fell apart thanks to Makoto throwing his game off with knowledge her native self had no business knowing, and she came closer than Rachel herself to destroying his plans in the continuum shift, only failing due to bad luck; even then, she blows holes in his long game that never got patched over.
Celica Ayatsuki Mercury takes over in BlazBlue: Chrono Phantasma. While the Celica of the present day was murdered by Terumi, this one was evoked by Kokonoe for her rather distinct qualities: as a chronophantasma, she is technically not supposed to exist, meaning temporal Observers cannot track her movements, and anyone in proximity to her is equally obscured; while her healing magic and seithr-negation abilities can treat corruption in individuals and shut down Azure Grimoires in range of her. These last quantities made her ideal as the warhead for Kushinada's Lynchpin, which was the big reason Kokonoe evoked her in the first place. Not only did she blind Takamagahara and Izanami to various developments, but said obfuscations were used to further the damage to the villains' game of destiny, which led to Terumi's death; he had to self-observe to stave off his finality. Izanami was a villainous instance, as the heroes lacked knowledge to the nature of her existence before she revealed herself, let alone the full extent of the abilities at her command. The apocalypse the heroes sought to avert had gone in full swing despite their efforts due to her own hand in affairs.
BlazBlue: Central Fiction gives us Naoto Kurogane and Susano'o. The latter, like Makoto, makes some sense in context, but his true nature had been obscured and thus only makes sense in hindsight: the Susano'o unit which Hakumen inhabits had fragments of Terumi inside of it, due to the sloppy nature that Terumi extracted himself from within, and he becomes the single most dangerous threat when he takes it back because it was his original shell in the first place. As for Naoto, he was cast into the plot, and the dimensional pocket known as the Embryo in which the final events of the story take place, from a potential timeline by the third party known as Raquel Alucard. Only Relius knew he existed at all, and absolutely nobody knew anything about his motives or prowess, let alone anything of value except the fact that Naoto's presence interferes with Ragna's. Naoto's biggest benefactor in this world, strangely enough, is the aforementioned Makoto, who staged a last stand so he could escape to Ragna and the others, and he in turn staged a last stand so Ragna could rein himself in when his Azure Grimoire went berserk. While Terumi's plans almost succeeded as they were, the ultimate cause of his downfall was due to events so far beyond his control that he didn't even know they were happening in the first place, and at least one element of which was directly due to his own lack of due diligence loosening the guillotine enough for Ragna to drop on his neck.
Lavos is an extraterrestrial planetary parasite and the overarching threat of the story. Its existence is known to various people at various times - in prehistory it ended the war between cavemen and the Reptites by making planetfall and triggering an ice age, and in antiquity the Kingdom of Zeal tried to use it as an energy source, which wasn't that smart a move - but nobody knew its purpose until 1999, when it woke up.
The heroes use this to great effect when they jump around to other time periods. Robo is an android from the distant future, so naturally people in the Middle Ages aren't sure what to make of him. Crono, Marle and Lucca all learn magic over the course of their adventure, which catches both the Reptites of the prehistoric era and the Fiends of the Middle Ages by surprise, since in those time periods humans haven't learned magic yet or have forgotten it, respectively. The party's only big defeat comes when they visit the ancient Kingdom of Zeal, where they aren't out of context - Zeal is a nation of human mages with access to advanced technology that rivals the stuff from Robo's time, and the Prophet arrives beforehand to warn the natives about the meddlesome heroes.
The original scenario has you dealing with Darking. The next problem you have to deal with a few moments afterward is a mysterious powerful entity that suddenly awakened without any warning, possessed Darking and intend to destroy the world. There are actually a few sources that tell of said thing but they are rare due to said entity having ended entire civilizations several times in the past.
An old security alert you can find in Destiny calls the Darkness an Outside Context Problem by name. Fitting with the Iain Banks quote above, its arrival heralded the near-destruction of human civilizationnote total destruction only being averted by the intervention of our resident Outside Context Altruist. High technology means nothing to a malevolent Sentient Cosmic Force.
Danganronpa V3: Killing Harmony: No one considered the possibility of someone being killed during a murder investigation. It stops everyone cold and forces the Monokuma to make a new rule up on the spot.
In Dragon Age: Origins the Darkspawn are this to everyone except the Grey Wardens and the Dwarves. Since it's been hundreds of years since the last Blight, the people of the surface believed that the Darkspawn had been eradicated. When the Fifth Blight strikes, the people of Ferelden are left scrambling to prepare their defenses and it doesn't help that Ferelden has so few Grey Wardens to help. Things get worse after the Battle of Ostagar—everyone is too preoccupied with serious internal problems including a civil war and underestimate the true threat level of the Blight. Nobody in Ferelden is really prepared to fight monsters that a) vastly outnumber them b) carry a lethal and corrupting magical plague and c) are controlled by an insane dragon god that is unkillable unless a Grey Warden strikes the final blow.
In Dragon Age II, Cassandra and the Seekers are desperately trying to figure out who out of all the key players in Kirkwall, was the Big Bad responsible for the outbreak of the Mage/Templar War. Varric tells her that none of them are responsible, but the Red Lyrium Idol recovered from the Primeval Thaig certainly was a key factor in what happened.
Dragon Age: Inquisition brings us the Breach: essentially a giant hole in the sky connected to the Fade that constantly spews out demons and other nasty horrors, and is essentially ripping the world apart at the seams when it is first encountered.
Drakengard has the Grotesqueries. The only foreshadowing they get is a hint about the "Watchers" that Manah serves, but they don't show up until the player unlocks Ending D, which reveals them to be huge, man-eating babies with adult teeth and lightning wings, accompanied by a colossal, extremely pregnant Queen whose mere presence causes time and space to come apart. Needless to say, the cast is completely blindsided and has no idea how to deal with them.
Ending E drops Caim, Angelus, and the Grotesquerie Queen into modern-day Tokyo, where they abandon the hack-and-slash and dragonback combat used for the rest of the game to engage in a fiendishly difficult rhythm battle, which Caim and Angelus come out on top of mere seconds before the JASDF blows them out of the sky. Which kicks off the NieR series by introducing White Chlorination Syndrome to that world from humans coming in contact with the remains.
NieR is a post-apocalyptic fantasy game with a mix of magic and robots, so about the last thing anyone expected to happen in its supplementary material was an alien invasion.
NieR: Automata concerns the struggle between an army of alien-built Machines warring against hyper-advanced Androids serving the remnants of mankind. And then there's Emil, a former party member from the previous game who is the only explicitly magical being left on the planet. He was definitely an Outside Context Problem to the aforementioned alien invaders, however, and is the same to the player when fought as a Bonus Boss.
In the series' backstory during the 2nd Era, the Kamal (an Akaviri race of "Snow Demons") showed up one day out of the blue along the coast of Skyrim and immediately laid siege to the Nord city of Windhelm. Normally, the Kamal are part of an Akaviri Vicious Cycle where they freeze every winter and thaw out in the spring to attack the Tang Mo "Monkey Folk". For unknown reasons, they broke this cycle to invade Tamriel instead. According to captives taken, they were searching for someone or something called the "Ordained Receptacle." It took an alliance of ancient enemies - the Nords, the Dunmer (Dark Elves), and the Argonians - to finally defeat the Kamal invaders.
In the other direction, Uriel Septim V sought to restore the greatness of the Third Tamriellic Empire, which was wracked with internal strife and floundering support in the provinces at the time. To do so, he set out on a series of invasions outside of Tamriel. Over a span of 13 years, he conquered several island nations in the Padomaic Sea to the east of Tamriel. Then, he invaded Akavir itself. His chosen invasion point was in the southwest of Akavir, in the homeland of the Tsaesci, who were apparently quite surprised by the invasion. Unfortunately, instead of capitalizing on their surprise and confusion, Uriel wasted time sending messengers (who never returned) in an attempt to contact whoever it was that ruled the Tsaesci in order to negotiate terms of their surrender. Meanwhile, Tsaesci mounted raiders harassed Uriel's forces who, due to space restrictions on Uriel's invasion fleet, did not have cavalry of their own, leading to a slow Death by a Thousand Cuts. It is speculated that the Tsaesci fought back with an Anti-Magical field that weakened Uriel's Battlemages and Weather Manipulation that extended the Akaviri winter, caused a severe drought, and cut off Uriel's oceanic supply lines. Uriel was eventually forced to withdraw, and died in Akavir making a Heroic Sacrifice to cover the retreat of his legions.
In Skyrim, nearly everyone is blindsided by the return of the dragons. Supposedly rendered extinct following a concerted hunting effort thousands of years ago, they are now suddenly returning in vast numbers. Naturally, all of the parties involved in the Skyrim Civil War blame one another for the sudden reappearance of the dragons. The only group to have any idea where they came from are the Greybeards, and that's only because their mentor is a dragon.
The dragons see one in the form of the Dragonborn, a being who can end their eternal existence by devouring their souls. For a dragon, physical death is only a brief respite until another remakes their flesh, but there's no return from soul-death. And Dragonrend is in some ways even worse; it causes them to experience a finite existence, something that is so unnatural and unimaginable to them as to border on perverse.
The monsters in Evolve appear across dozens of worlds without any sign of how they got there, murder and demolish their way through every human settlement they can find, and then terraform the planet into a Death World. Attempts to study and understand them just seem to raise more questions, like why their genetic structure seems artificial, how they interact with and manipulate reality warping forces, and why their "eggs" don't contain fetal monsters when broken open and give off signals similar to those produced by FTL engines. Eventually, it's discovered that they're extradimensional beings whose dimension also connects to the one the humans use for FTL. Using that dimension as a stepping stone, they pass through and form physical bodies out of materials they know how to replicate and produce. As to why they're exterminating humans, the futuristic power sources the humans use for FTL, energy shields, weather control, and other such technologies have the side effect of manifesting in a constant storm of destruction in the monster's world, something they'd very much like to stop.
The Lostbelts in Fate/Grand Order are alternate histories that diverged too far from the main timeline to continue, and are thus filled with outside context problems by their very nature. It works both ways, however, as even simple devices such as portable long-distance communication can be non-existent in an otherwise technologically advanced Lostbelt.
Final Fantasy games are fond of this, with the villain often being something utterly alien to the protagonists:
The Cloud of Darkness from Final Fantasy III is familiar to the World of Darkness, but wholly unknown to the World of Light.
The Lunarians (specifically, Zemus, Golbez, and the Lunarian Lost Technology) in Final Fantasy IV, which include the hero, on his father's side anyway. He was raised as a human, so he's just as baffled by the powers of his father's people and the artifacts they left behind. There's supposedly mostly good Lunarians, but we only see one and a FaceHeel Turn.
Exdeath of Final Fantasy V is known to the inhabitants of the world he comes from, but utterly unknown in the other. Fortunately, people from his world follow to help the defenseless natives of the protagonists' world fight him.
Jenova in Final Fantasy VII, an invading planet- and life-eating parasite from space. The main villain Sephiroth also gets some of this quality partly from Jenova. While both Shinra and members of Avalanche (the eco-terrorist group opposing Shinra) knew him from before, they didn't really know him — especially what his connection to Jenova meant since they didn't know what it was. As he makes his return, he derails the plot from the fight between Avalanche and Shinra into both trying to stop him without really knowing what he even wants.
The Terrans of Final Fantasy IX, which, like IV, include the hero, who, like IV, has gone native. Unlike IV, all the other aliens are of the "invade and help their planet devour the souls of those that live on ours" variety.
Stormblood has many of the bosses that appear as part of the Omega raids: several of them, such as Exdeath and Kefka, are stated to be characters from tales told by other civilizations made manifest by Omega's reality bending abilities. Omega, itself, is also revealed to not be an Allagan creation as was originally suspected, but rather, a machine that was not native to Hydaelyn at all.
Shadowbringers has the machine lifeforms from NieR: Automata, as well as the android 2P and 9S, appear in the world of The First as part of the YoRHa: Dark Apocalypse raid questline. Technology in The First, as well as in Hydaelyn, are nowhere near the level of sophistication needed to create machines that appear as human and lifelike as 2P, and the idea that machines can even be considered a form of life is completely alien to them.
A crossover event with Final Fantasy XV introduces this on both sides. Starting in XV, Noctis and the gang encounter a miqo'te woman who can use a form of arcanum, a form of magic completely alien to the world of Eos. The Ixali beatmen that wound up on Eos along with the miqo'te also use a form of summoning completely unlike what Noctis can do, using energy from meteorshards in lieu of aetheryte to summon Garuda, a simulacrum of their patron goddess. In XIV, the MT armors that wind up on Hydaelyn are of a level of technological sophistication that dwarfs Garlean magitek, as well as with Noctic's Cool Car. The Ixali's attempt to summon Garuda also goes awry as, due to Noctis's presence on Hydaelyn, they inadvertedly summon an actual divine being in the "Messenger" allied with Noctis that took Garuda's name for her own.
Final Fantasy: Crystal Chronicles builds up an entire plot about memories, with side characters such as Leon Esla and the Black Knight providing a glimpse into the true conflict of the plot. Then you get to the final level and fight... an alien parasite worm from outer space equipped with laser turrets, and who's been the source of the miasma for eras ever since he crashed. After the lengthy bossfight you fight the more expected villain the game was building up as the final boss, but that doesn't make it any less jarring.
The Shivans from Freespace. In the middle of a galactic war between humans and an alien race called the Vasudans, suddenly a second, obscenely powerful and advanced alien race arrives and effortlessly crushes everything in sight, forcing a truce between humans and Vasudans just to protect themselves. Their shields even render them completely impervious to all weapons until R&D introduces some shield-busting weaponry.
In God of War (PS4), Kratos ends up being one due to being a Greek god in the Norse-Pantheon controlled Scandinavia. While the fact that he fathers Loki and the giants refer to him as Fárbauti suggests the universe tried to balance him into the role, this doesn't stop him from doing things that shouldn't be possible and actually defying several prophecies. In Norse mythos You Can't Fight Fate is a recurring theme and proven to be an unbreakable truth, but somehow Kratos manages to Kill Thor's son Magni and later on Atreus kills his other son Modi - two gods who were supposed to survive Ragnarok and at the end of the game his killing of Baldur and starting Ragnarok 100 years before it was prophecized suggests he's completely thrown off the script.
GTA Online: The Doomsday Heist presents one in the form of Cliffford and Avon Hertz. While most villains in the franchise are relatively grounded in their goals — whether it be controlling local territory, gaining lots of money or reputation, or rigging the economy or politics — these two take it a giant step further with their plans for creating a worldwide dystopia where they will murder billions of people by triggering a thermonuclear war and rule over the remains and the clone society they will create.Grand Theft Auto has taken many turns throughout the years, but never before has it produced such a pair of highly ambitious and blatantly sci-fi villains.
First, in Nightfall, was the return of Abaddon, the fallen sixth god, and his Margonite followers. The other gods had gone to great lengths to render him an Un-Deity, so much of the players' knowledge of Abaddon is learned while on the run from his various armies.
Second, in Eye of the North, was the appearance of the Destroyers. While foreshadowed in an obscure Dwarven prophecy, nobody really knew about them until they were already halfway through slaughtering the Asurans. Even by the end of the campaign and their destruction very little was actually known about the Destroyers beyond that they were an enemy.
Third, in the sequel, Guild Wars 2, is the appearance of the Elder Dragons. While they have been present since long before man or god walked the land, they were largely dormant and only hints of their power were seen.
Throughout Kingdom Hearts, Sora has fought both Heartless and Disney villains who used the power of darkness, and Sora managed to defeat them. But once Sora successfully seals the Keyhole in Hollow Bastion, he suddenly receives a notification from the Princesses that a mysterious man has appeared in the Chapel where Sora defeated Maleficent's Dragon Form where according to them, this man is neither a Heartless nor a human, but "something else", and he is stated to use a power not from the darkness or light. So Sora decides to enter the portal to investigate, and suddenly a hooded man in Black Cloak shows up and makes vague proclamations how Sora looks like "him", and how he is familiar with Ansem. Sora is understandably confused about all this, the hooded man decides to test his skills, and proves to be stronger than any of Sora's adversaries up to that point, including Ansem. At the end, when it seems that the Sora has beaten the hooded man, he just shrugs it off and finds the Keyblade wielder amusing and promises Sora that they will meet again soon and he departs, but not before vaguely telling Sora that he is just a "mere shell" when Sora asks who he is. This whole incident left everyone and the audience confused with so many questions asked as to who the man in the Black Cloak is and what he wants with Sora. Apparently, according to Ansem's reports that is obtained after beating him, that when a heart leaves its body, that body itself becomes a Nobody and it is stated to be a form that doesn't actually exist. Said mysterious figure is revealed in II to be Xemnas, leader of Organization XIII.
On a smaller scale, Sora, or rather Sora's Keyblade, gets to be this in Kingdom Hearts II in the world based on Pirates of the Caribbean. Since it's not from that world, it's not subject to that world's rules - which means it can permanently kill the cursed pirates. This is also why magic works well on them too.
The Conqueror in The Last Remnant shows up out of nowhere with an army and starts capturing Remnants until the current world order recognizes him as a ruler. As it turns out, this is a Humanity on Trial thing to see how humans are using the power of the Remnants. They fail.
This is a major plot-point, along with Rogues Gallery Transplant, in LEGO Dimensions — thanks to Lord Vortech's attempt to conquer the multiverse and subsequent rift abuse, villains are scattered all over the place where they logically shouldn't be. For instance, Sauron lands his tower right into the middle of Metropolis. The heroes themselves— Wyldstyle, Batman, and Gandalf, along with any other figure you've got— in turn serve as this to the various villains.
In the original Mass Effect trilogy, the Reapers intentionally invoke and weaponize this. Every time they destroy galactic civilization and wipe out the most advanced species, they go to a great deal of effort to also wipe out any trace of themselves, but leave enough behind of their victims to give the next wave of civilizations an assumption that the mass relays and Citadel were the products of the previous civilization, as well as some technology to ensure that the next wave's technology develops along the same paths. Thus when the Reapers come out of Dark Space and attack, they know they're unlikely to face any independently developed novel technology that threatens them and no one is prepared to face mind-controlling technorganic Eldritch Abominations with superior technology who can instantly seize control over galactic government and travel.
This is one of the reasons why the Reapers still manage to wreck much of the galaxy even without their normal advantages. The current Citadel's method of warfare depends on a degree of synergy between the three biggest members: the turians, asari, and salarians. The turians provide a conventional military force of disciplined soldiers and powerful navy and ground army, while the asari function as highly elite light infantry and commandos who conduct guerilla operations, raids, and other behind-the-lines operations, and the salarians gather massive amounts of intelligence on the enemy, disrupt their intelligence, logistics, and command structure, and conduct cyberwarfare to cripple the enemy before a war even starts. Because the Reapers came out of nowhere, and have a much more advanced computer technology and virtually no logistics or society or communications to exploit, the salarians' cyberwarfare and intelligence arms are utterly useless against them, and their overwhelming numbers and power mean that they can easily brush aside the lighter asari military forces with ease once they defeat the asari fleets. Only the turians are able to fight the Reapers head-on, and even then they need the help of the krogan to have a chance of holding the line, while the asari are forced to fight guerilla battles on their occupied planets and the salarians are just outright ignored.
The first game even has the asari councillor give this as the exact reason they can't and won't help Shepard: Their best agent going rogue and getting an army of killer robots on his side, they can handle. Their best agent working for an angry giant robo-cuttlefish to exterminate galactic civilisation as it has done for aeons, they cannot. So their solution is to ignore the idea, and Shepard's warnings, completely.
Mass Effect: Andromeda kicks it up a notch; while they had the foresight and the technology to map out habitable planets before departing, it turns out that in the 600 years that they took to arrive, a pheonomenon known as the Scourge appeared, and basically destabilized (or outright destroyed) the planets the Andromeda Initiative intended to inhabit. The Scourge, being a nasty mix of radiation, dark matter, and Element Zero, seemingly came out of nowhere and, on top of poisoning the very planets they intended to live on, also damaged the Initative's ships and their main hub, leaving 100,000 people marooned in an alien galaxy. On top of that, the first signs of intelligent life they encounter are the sociopathic, dogmatic Kett who seem more intent on shooting and kidnapping for unethical experiments than making peace. Compounding both of these issues is the fact that the Initiative is a mostly civilian organization rather than military, and as such their defenses are limited to small arms, some ground vehicles, and light fighters while their opponents are fielding fully-armed capital ships. Needless to say, the Initiative is way out of its league, and it's left up to the Pathfinder to keep it all from going to hell.
Mindustry has the Frozen Forest, where enemy waves consist only of ground units, and the map has a lot of coal, encouraging you to build anti-ground Hail turrets. However the boss of that stage is a flying unit, and will wreck your base if you neglected to build anti-air defenses. It's also one of the first stages, meaning that you likely haven't yet survived long enough to know that a boss would eventually spawn.
This isn't normally a big issue in the world of Monster Hunter, as even the strangest of beasts (from golden mantises that wield Humongous Mecha to crystalline dragons from outer space) can still be bested by hunters with enough time, effort, and preparation. Then Monster Hunter: World came along, and new issues popped up.
Behemoth is a monster from an entirely different universe, and this shows in how it fights. While it is classified as an Elder Dragon, it is unique in that, unlike all of the other fantastical beasts in the Monster Hunter universe, it is a truly magical creature, and makes ample usage of them in the hunt against it.
For Comparison: Behemoth is classified as an Elder Dragon, a waste-basket group for creatures that are essentially living forces of nature, yet are still understood to some degree. Leshen, however, is classified as a Relict, its designation in the Witcher universe, showing that it is unlike anything ever seen in the Monster Hunter universe.
In NefariousYOU are the outside context problem. In a world of superheroes with their designated Card-Carrying Villain, Crow breaking away from his designated oponent Mack (due to Mack getting bored with fighting him and letting him win) results in him moving on to the other kingdoms of the world, the heroes of which have no idea how they're supposed to fight an opponent they've never seen before. While Crow couldn't beat Mack on his own turf, Crow can come out victorious against all the various heroes whose princesses he goes after.
In Pokémon Mystery Dungeon: Gates to Infinity, the Bittercold is this for the entirety of the Pokémon franchise, being the first boss besides Dark Rust in Pokémon Rumble Blast that isn't a Pokémon or a Pokémon trainer. Instead, it's a crystalline embodiment of despair and hopelessness, given form because how much negativity has been going around in the Pokémon world as of late. Simply being near it causes Pokémon to suffocate and, if left unchecked, it has the potential to destroy the entire world. It takes the intervention of a similarly-outside-context entity (a Nature Spirit in the form of a Pokémon) to destroy it, as, knowing no Pokémon can do the job, they decide to summon humans who can resist its debilitating effects.
Pokémon Super Mystery Dungeonfollows it with Dark Matter, another eldritch force that is not a Pokémon and which can turn even the legendaries into stone. It's also hinted to be the Bittercold once again, with a new slew of powers and even sentience.
Pokémon Sun and Moon has the Ultra Beasts: strange creatures that appear to be neither human nor Pokémon, but are causing problems in Alola. It turns out that they are Pokémon that hail from another dimension referred to as Ultra Space, and apart from Nihilego, who may not even be sentient, they aren't out to purposely destroy anything but are more like scared animals dumped into an alien and unfamiliar environment.
Pokémon Ultra Sun and Ultra Moon has a different kind of Out-of-Context problem: Team Rainbow Rocket. Made up of the villains from the previous main series games, they hail from Alternate Universes where they succeeded in their goals. They unexpectedly take over Aether Paradise in order to take over all dimensions.
In the Game ModRise of the Reds for Command & Conquer: Generals, the European Continental Army proved to be one of these for the Global Liberation Army. The GLA had previously overrun large parts of Germany and destroyed or looted large parts of central Europe with little response from the armies of the EU, leaving them to believe that the Europeans were weak and helpless and had to rely on the Americans and Chinese to protect them. A decade later, the various European countries (with Chinese help) had rebuilt and re-armed and create a new, powerful, technologically-advanced allied army. The GLA, mostly focused on internal squabbling and fighting the Chinese, were unprepared when the ECA came looking for revenge, and their advanced technology utterly ruined the GLA forces in Africa with weapons and vehicles they had never seen before.
The ECA tended to use these routinely on the Russians when they invaded Europe. While the Russians mostly relied on powerful but conventional weapons and firepower supplemented by Tesla weapons, the Europeans resorted to highly-advanced prototype weapons that completely blindsided the Russians, like the massive AI-driven Manticore tank with nanomachine repair tech, the Solaris fusion satellite arrays, and the Valkyrie armor system. In fact, the ECA even has a specific technology, the Venom Protocol, which causes their army to switch from conventional weapons to extremely advanced prototype weaponry.
The GLA proved to be one for the Russians and every other power operating in Africa, despite the fact that they knew the GLA still existed. After going underground (literally in many places) the GLA re-armed and re-equipped their army and then launched a sudden, unexpected attack on their numerous enemies with wholly new and unexpected weapons and equipment, including actual aircraft (which they couldn't field in the base game). They hit the Russians with such ferocity that they annihilated their main army in North Africa overnight.
Saints Row: Gat Out of Hell goes one step further when the Boss is abducted by Satan, forcing Gat and Kinzie to chase after him into Hell, where they're both cut off from the rest of the Saints. The only reason this isn't more of a shock is because it came out right after IV.
Before that, in Saints Row 2, the majority of the game is spent fighting other street gangs, who while more powerful than the Saints initially, aren't all that different outside of what vehicles they drive and some slight variation what weapons they use. When all three of the street gangs are eliminated, the Boss is out celebrating their victory, when out of nowhere heavily armed commandos with armored personnel carriers storm the building and simultaneously attack the Saint's headquarters. These guys belong to ULTOR, the aforementioned Mega-Corp. And while we the players have been privy to their attempts to manipulate things behind the scenes, to the Saints, the corporation's sudden attack comes as a completely unexpected surprise.
Saints Row: The Third had been spending most of its storyline pitting the Saints against the Syndicate, a multi-faction criminal organization in control of Steelport. They are too occupied with battling each other to notice Senator Monica Hughes, nursing a grudge against the Saints, authorizing the STAG Initiative, a highly-armed military force equipped with futuristic weaponry and vehicles... until a meeting of the Boss and Oleg with Viola DeWynter (who was preparing to do a HeelFace Turn to get revenge on Killbane for killing her sister Kiki) gets disrupted by STAG's arrival, and all of the Saints are completely blindsided. For that point on, the Saints must battle both the Syndicate and STAG.
The 3D Sonic the Hedgehog games generally use this as their source of villainy, as usual Big Bad Dr. Eggman's role is often demoted in these titles, either trying to benefit from the fact the villain is outside the typical context of the series or only rising to the level of being an instigator of the events and then losing his grip on them after some of the plot has passed. Examples include Chaos (a water monster from ancient times Eggman has been trying to harness but only ends up aiding its vengeful rampage),Biolizard (a last-ditch experiment by a mad scientist aboard a space colony as his final parting gift for a world he believes betrayed him), Metal Sonic (the selfsame Robot Me of Sonic, now rebelling against Eggman in an effort to assert its own dominance), the Black Arms (an army of alien invaders whom Eggman opposes because he can't conquer the world if they destroy it), Solaris (a time-bending Eldritch Abomination), Dark Gaia (an ancient monster resting within the Earth), the Time Eater (a time-eatingEldritch Abomination), and the Deadly Six (a group of wicked Zeti that Eggman lost control over when Sonic pulled a Nice Job Breaking It, Hero!).
In Spyro Orange and Crash Purple, the protagonists suddenly find themselves the victims of a villain switcheroo, and have to take on each other's archnemeses.
Similarly, the Shadow Minions from Spyro: Shadow Legacy. Even Spyro couldn't damage these things until he started learning Dragon Kata.
The Zerg, who are a Horde of Alien Locusts from another part of the galaxy. The Zerg are out-of-context for the Protoss more than anything, since they were running the galaxy as part of their "Great Stewardship". They never imagined a Horde of Alien Locusts coming out of nowhere with the explicit purpose of assimilating them, and destroying their ancestral homeworld.
The Protoss were pretty out-of-context for the Terrans as well, the Terrans discovered they were not alone when a massive fleet showed up out of nowhere and sterilized one of their colonies.
The United Earth Directorate from Brood War is another example. The Zerg are at least comprehensible to the Protoss as they are also a creation of the Xel'Naga, and part of their power comes from absorbing Xel'Naga knowledge. Terrans, as far as most of the Protoss are concerned, are a bit of background noise in their fight with the Zerg. But then a fleet from Earth shows up and (for a time at least) controls the Zerg and becomes the top power.
The Dark Voice and his Hybrids also seems to be this in StarCraft II, especially in the Bad Future: the Zerg were the main threat that everybody recognized, and then, just as Kerrigan was killed to defeat the Zerg, the Fallen One came in, took over the Zerg, and used them to bring everlasting darkness to the Universe.
Played with in Star Wars: The Old Republic: Sure, the Republic and Jedi have been in cyclical wars with the Sith Empire. Thing is, actual Sith haven't been seen by the Republic for centuries. They thought that the Sith had all been wiped out by a combination of infighting and war. Thing is, they had merely retreated to a part of space not on Republic maps and spent the next few years rebuilding. The Sith they had fought in the centuries since, like Exar Kun, were all fallen Jedi who had unilaterally adopted the name or were backed by ancient Sith ghosts. Revan stumbled on them, got put under a mind-whammy from the Sith Emperor, and sent out to conquer, but the events of the games wiped Revan's memory of the actual Sith, so the Republic thought Revan's followers were all there were. Of course, Revan eventually remembered, recruited the Exile, and they promptly grabbed the Idiot Ball, blundering into an incredibly obvious trap, and they made no attempt to warn the Republic. 300 years later, the Empire invades, the Republic is caught with its pants down, and we get the opening situation with the Republic on the verge of destruction.
The Eternal Empire of Zakuul is this even more so. RepublicEmpire conflict has been going on for decades at this point, alternating between open hostilities, uneasy truce, a Space Cold War, renewed conflict, and another truce set up by a Reasonable Authority Figure on both sides. With no setup or foreshadowing, either in this game or the larger Expanded Universe, an entire new Empire emerges from Unknown Regions, secretly built by the Sith Emperor over past centuries. Their technology is superior to anything Republic and Empire have to offer, so they Curb-Stomp both sides, subjugating an entire galaxy within a year and leaving both the Empire and the Republic with no further means or resources for open hostilities.
The Smithy Gang from Super Mario RPG, an enemy so outside normal context that it caused an Enemy Mine between Mario, Peach, and Bowser!
Taken to its furthest extreme with Culex, the game's Bonus Boss. The joke is that Culex is a villain from Final Fantasy that somehow wound up in Mario's universe, right down to a Non-Standard Character Design that boasts sprites in the games' style, music that plays in all of his scenes being franchise standards, and fighting with four elemental crystals. When defeated he departs back to his own universe, lamenting "In another time, another game, we might have been mortal enemies."
In Super Paper Mario, Bowser ends up working with Mario, Luigi, and Peach to take down Count Bleck.
In Sunrider, the people of the galaxy have enough on their plate already between pirates, slavers, the escalating war between two galactic superpowers, and occasional run-ins with ancient but still-functional (and hostile) Lost Technology left behind by the Ancient Ryuvians. Nobody is expecting a time-travelling Ryuvian fleet led by a man who wants to rebuild his peoples galaxy-spanning empire in the present day to suddenly show up, which is just what happens in The Stinger for Sunrider Liberation Day.
There's also Galeem(and later, Dharkon) from Ultimate's story mode, World of Light. Shows up from out of nowhere with an army of Master Hands, and proceeds to obliterate everyone and everything in sight, sans Kirby who manages to escape on his Warp Star. The rest of the mode consists of Kirby rescuing and rounding up the other fighters to take the fight to it.
The New Order Last Days Of Europe: There are many warlords vying to reforge the fragmented territory that was once Russia in the image of their own ideals, ranging from the sane, the guards both old and new, to the utterly bizarre and even insane, for good or ill. But they are all figures that had a part in the Russia of old, or in the wastelands... except one. The pragmatically fascist folks in the Free State of Magadan can hire Mitchell WerBell III's band of mercenaries to help in taking over the Eastern Siberian wastes... and the guy in charge of actually paying them dies before he can, leaving the mercenaries with no other resource than an attempted coup. And this coup can succeed, spiralling off into the insanity that is the Republic of West Alaska path, which has a genuine shot at reunifying the East, and then the entirety of Russia, under a mercenary banner, utterly baffling every country on Earth (with USA desperately trying to explain they had no part in this). As a result, the nations from an alternate history where the Reich won can find themselves contending with what is basically Metal Gear Solid: Peace Walker's Outer Heaven, except unfathomably bigger in terms of controlled territory.
The protagonists of Until Dawn spend most of the game dealing with a masked psycho out to kill them in an isolated cabin in the woods. Except he isn't. He's a deranged but ultimately harmless former friend who wanted to pull a massive prank on them. Except somethingis killing people. And that something turns out to be a pack of supernatural wendigos that just happen to call the area around the cabin home.
In Warcraft, the Void, while originating at the dawn of time and inadvertently helping to create the universe, is this for life in the universe. Even the titans, god-like beings who travel the universe creating life, were surprised to learn of the Void's existence. Sargeras in particular was so horrified by the existence and nature of the Void, he formed a demonic army with the purpose of wiping out all life in the universe, as he saw a lifeless universe preferable to one dominated by the Void.