Earth, 2053 AD. The year the old world could be said to have truly ended.
The exhaustion of natural resources. Environmental pollution and the melting of the ice caps. Overpopulation, and growing extremism among the marginalized populaces of the world. The world economy straining and buckling under the bloated weight of the world. It was only a matter of time before the established world order lost control, and the violence gripping the Earth Sphere exploded into World War Three.
Terrified of the destruction it had wrought, mankind sought to end the fighting through the unification of all nations, and all peoples. Thus, from the ashes of the greatest human-on-human war in known history, the world order that has stood until this very day arose. The United Earth Federation, with dominion over all governance, all economics, and all military matters, promised a new golden age for mankind as it stood truly united for the first time in its history.
The Federation sought to mend the scars of the old war through the colonization of a new frontier - space. The construction of the space colonies begun decades earlier was completed, and millions of people were moved into space, greatly relieving the issues of overpopulation still plaguing the planet. This was the new era they called the Universal Century, and drawing its strength from the quantum leaps in the fields of physics and energy achieved during the war, mankind catapulted itself farther out than it had ever been before. The Lagrange Points, the Moon, Mars, even as far out as Jupiter...
Space was not just the new frontier, but an ocean of hope. Numerous asteroid cities and space colonies were constructed in an astoundingly short span. The beginning of the Universal Century calendar, with the influence of mankind extending all the way to the orbit of Jupiter, could be called Earth's honeymoon with Space.
However...Like all honeymoons, this could not last.
It is the nature of mankind to form tribes, and hate the 'other'. While there were (supposedly) no more borders on Earth itself to fuel prejudice, there was one that separated the 'haves' from the 'have-nots'. Those who were moved into the space colonies gradually came to be seen as second-class citizens compared to those who remained on Earth, derisively named 'Spacenoids'. Fourteen years ago, in the year UC0079, these biases blossomed into outright hatred when the Spacenoid nation of Zeon declared independence and launched an invasion of Earth, starting what would go down in history as the One Year War.
This conflict was a new paradigm in human warfare. While giant fighting robots were no alien concept by this time, super robots such as Getter Robo, Tetsujin 28, Energer Z and Giant Robo having proved their worth in the decades prior, this was the first time that the mass produced mecha known as Mobile Suits were used in actual war. With their armies of Zaku IIs, Zeon steamrolled the inferior UEFA forces, and their threat was only compounded by the legendary Big Boss turning traitor to the UEF to form his sanctuary known as Outer Heaven in unity with Zeon.
Then, with the worst possible timing, the powerful, nigh-unstoppable and completely inhuman entities known as Angels suddenly attacked Japan's Tokyo-3. While this was not humanity's first encounter with aliens (the shapeshifting Invaders having attacked the moon several years prior), this was the first encounter with aliens they could not communicate with in any way. The only weapons capable of fighting these Angels were NERV's super robots, the 40 meter tall psychic titans known as Evangelions. NERV had apparently been preparing for this ever since Second Impact, the mysterious world-wide disaster that occurred 15 years beforehand. If the Angels weren't bad enough the Invaders also returned, despite having been seemingly eradicated in the Moon Wars years prior.
Contact with Mars was also lost shortly before the invasion of Zeon, but this matter was quickly dismissed by the UEF government in favor of the direct dangers facing the Earth Sphere.
Facing this unprecedented crisis, the Earth Sphere looked to be on the path to absolute destruction until one man intervened. The billionaire philanthropist Kouzou Hadou stepped forward, proposing the formation of a special unit made up of the most powerful robots available to mankind to combat the various threats they faced. Bringing together the prototype UEFA mobile suit codenamed Gundam along with its support ship the White Base, NERV's three operational Evangelion units, the legendary Getter Robo (despite its pilot Ryouma Nagare being in prison beforehand), Energer Z, the mysterious mechanized knight Talisman, and his own Deus Machina Demonbane in conjunction with a dozen other super robots, Kouzou Hadou's Hokuten Irregulars saw their first outing as a single unit.
Nobody could have possibly known that this would be the beginning of humanity's slow demise.
The Irregulars proved invincible in combat, crushing one foe after another. Zeon was pushed back into space, and eventually routed for good at the orbital fortress A Baoa Qu. Zeruel, the mightiest Angel since their first appearance, fell at the hands of Ryouma Nagare and the Getter Robo. The Bardoz Island incident, where Doctor Hell sought to awaken an army of ancient super robots to wage his own war on the world, was resolved quickly and without any major issue, the island itself being sunk beneath the waves. And no matter how fierce their attack, the Invaders failed to make a dent in humanity, being eradicated wherever they arose.
Things were going so well...until that fateful day, when Professor Saotome revealed himself to be alive. Thought to have been murdered years ago by Ryouma Nagare, the creator of Getter Robo was indeed very much alive - and completely insane. Having built a titanic monster he called Shin Dragon, and backed up by an army of superior G model Getter Robos, he declared his intent to destroy the world. With the UEFA depleted by the One Year War, the Hokuten Irregulars were the only thing standing between Saotome and humanity's extinction.
But...they were not up to the task. Even with the all-powerful Shin Getter Robo, salvaged from Japan's abandoned Saotome Laboratories, humanity's mightiest robot corps found themselves forced back by Saotome's army. Even as they cut down Getter G's in droves, Shin Dragon itself proved too powerful for them to face. It was only after Saotome's monster consumed Evangelion-00, Saotome seeking whatever arcane force powered the machine for his own use, that the tide turned.
Shinji Ikari, pilot of Evangelion-01, flew into a rage. Under his control his machine broke past its previously established limits and, for a brief time, became a God. With its newfound power it went head to head with Shin Dragon, and where the entire Hokuten Irregular unit as a whole had failed it alone succeeded. When Eva-01's arm was ripped off, it used its AT Field to instantly construct a new one made from pure energy. If Shin Dragon tried to vaporize its foe with its mighty Getter Beam, Eva-01 shredded the gigantic laser with a razor-thin beam of light from its eyes. And when Shin Dragon groaned in agony, Eva-01 roared in triumph.
But all power has its price, and this price was heavy indeed. Its not quite known what happened when Eva-01 struck the final blow, as none present could fully comprehend what they were seeing, but the effects were felt all across the planet. The oceans and skies were dyed blood red. Cities crumbled and fell as earthquakes devastated entire continents. People spontaneously turned into puddles of orange goo, and empty suits of clothing littered the streets.
Thus did Kashgar become ground-zero to the beginning of the end of all life on Earth. This was Near-Third Impact (N-TI), initiated by Eva-01 exceeding its mortal limitations. And, just as suddenly as it started, it stopped.
In the aftermath, the battered and broken Hokuten Irregulars were disbanded. Many of their number had been killed or just outright vanished during that final confrontation with Shin Dragon. Humanity thought that, with the One Year War over, it was safe...But it wouldn't be too long before everyone understood the real consequences of Near-Third Impact (N-TI).
A mere week after, innumerable monsters surged across Asia. The Invaders were an old foe, but there were more - entirely new threats, seemingly appearing out of nowhere. The BETA, a seemingly-endless endless horde of hideous monsters that consumed all they passed over like a plague of giant locusts and adapted to any tactics used against them exactly 17 days later, and the Festum, golden angelic beings that assimilated anything they came into contact with and read the minds of their foes. Together with the Invaders, somehow more numerous than ever before, these new threats proved too much for the forces of Earth to handle.
As the world was rocked by this unprecedented danger, people couldn't help but wonder where these monsters had come from. By all accounts, they had just appeared out of nowhere. Eventually, though, their origin became clear - Kashgar. The Near-Third Impact initiated by Shinji Ikari had somehow empowered the Invaders, and pulled the BETA and Festum into our reality. As a testament to this truth, a colossal structure now stood at the site of the Hokuten Irregular's battle with Shin Dragon. This was the first of many massive Hives that the BETA would construct across the world over the next decade and a half.
While there were some who thought something was wrong with this explanation, citing the loss of communication with Mars before the One Year War as evidence, they were quickly silenced. After all, it was much more convenient for certain powers that be to lay all the blame at one boy's feet than to investigate what had happened to some Spacenoids a years travel away from Earth. (As it eventually turned out, the planet was overrun by the BETA.)
A mere three years after N-TI, the entirety of Asia and a chunk of Europe was overrun by the alien menace. The once fertile plains of the lands occupied by the invaders were consumed by the hordes and reduced to barren, lifeless wasteland, the people that once lived there either eaten alive by Invaders and BETA or turned into green crystal and assimilated by the Festum.
While making a valiant effort to hold back the aliens, the mass produced machines of the UEFA were just not enough. In order to combat this triple threat, a new type of army was needed. One made up of the greatest weapons known to mankind - Super Robots. The Super Robot Army, as it was succinctly called, sought to emulate the success of the Hokuten Irregulars on a much larger scale, with individual abilities and powers so varied that the BETA would be unable to fully adapt, stationed in headquarters called Shatterdomes all across the world. A call was sent out for robots, pilots, scientists, anyone and anything the UEFA could get their hands on, and absolute authority over the organization was handed to the ex-Getter pilot Hayato Jin.
While the Super Robot Army made valiant efforts, even with backup by more conventional UEFA forces they were unable to stop the alien advance completely. The Festum were able to read the pilots minds and assimilate them through their machines, the Invaders were nearly unstoppable and would not stay dead, and the BETA's sheer numbers would eventually wear down even the most invincible of Super Robots.
Things got worse when the BETA finally developed a genuine adaptation to the Super Robot Army - Category 3 BETA, which possessed unique gimmicks similar to the Super Robots themselves, and the dreaded Category 4 BETA, by far the largest living creatures to ever walk the Earth. While the Category 3 and 4 type BETA were relatively rare, they were all completely unique beings that required their own tactics to take down, and it wasn't surprising to see dozens of brave pilots die every time one stepped onto a battlefield. The BETA had turned humanity's strategy against it.
Soon enough, however, mankind would regain their advantage. The development of Drift technology, which allowed two compatible pilots to synch their brainwaves, was one of the key factors behind the creation of two entirely new classes of Super Robot. The titanic Jaeger-class robots, which at eighty meters each were by far the largest fighting machines created by man, easily capable of matching a Category 4 BETA in single combat, and the significantly smaller God-class robots, capable of separating into two individual units while maintaining a Drift over long distances, and when combined were some of the most powerful Super Robots since the founding of the Super Robot Army. However, despite the advantages of the Drift system, only a handful of people on the planet were Drift-compatible, and only a fraction of those were made of stern enough stuff to pilot a Super Robot.
But despite this good news, not all was well in the Super Robot Army. Not only were they constantly taking losses from alien raids, but now there were deserters and traitors, taking their mechs with them into the Asian badlands to form gangs and their own little kingdoms, returning only to raid the outside world for supplies and slaves. Unlike the Super Robot Army loyalists, who had to protect the entirety of civilization from the invaders, these outlaws and warlords were able to survive by constantly moving around and fighting the occasional skirmish against the aliens to protect their little fiefdoms. Like this, they could survive fairly reliably - but it was a lifestyle that only the hardy (and slightly insane) men and women who piloted Super Robots in the first place could truly thrive in. Worse, there are rumors that some of the outlaws and traitors have made pacts with the aliens themselves, essentially selling their souls to humanity's enemies in exchange for power and safety.
Between these traitors, the constant advances by the alien menace whose control now spread from the shores of Normandy all the way to Japan, continuing tensions between Earth and the colonies, and several poorly-timed terrorist attacks (most notably Operation Stardust, in which the nuclear-armed mobile weapons GP-02 and Metal Gear Rex were stolen by anti-Federation rebels), the Federation slowly turned from a slightly corrupt and complacent bureaucracy into a totalitarian police state. This decline into dictatorship ended with the formation of the Titans special forces unit, who soon usurped nearly all authority over the world from the Federation.
Everything came to a head in UC0089, when three separate forces announced their intentions to take over the world. Revolver Ocelot declared that he was inheriting the will of Big Boss as much of the world's military systems effortlessly fell under his control thanks to years of trickery. The Katou Organization, a shadow long-rumored to be a force in international politics throughout history, publicly revealed both itself and its ambition, their words backed by the super advanced mecha known as Machina and Arma. And worst of all, the infamous Doctor Hell returned with the very same army of ancient robots from Bardoz Island he had tried to command a decade ago, fully intent on conquering the entire free world.
It seemed like Earth was doomed. Between the constant threat of alien attack, the tyranny of the Titans, traitorous and violent outlaws and three separate human forces vying for world conquest, things looked hopeless. The world needed a hero that could stand against these evils to fight for justice and the common man!
That man was, once again, the billionaire Kouzou Hadou. Under his command, the Hokuten Irregulars were formed for a second time, more powerful than ever before. Unlike last time, entire organizations flocked under the Hadou Corporation's banner of justice. The Anti Earth Union Group, made up of veteran pilots from the UEFA most notably including Bright Noa, Amuro Ray, and newcomers Kamille Bidan and Quattro Bajeena. The Evangelions of NERV, their veteran pilots eternal children thanks to the Curse of Eva. JUDA Corporation, which was seemingly a medical goods producer but had in fact been collecting Machina in secret to face off against the Katou Organization. The unsinkable fortress of steel Mazinger Z, the successor to Energer Z that was piloted by Tetsuya Tsurugi's nephew Kouji Kabuto, and backed up by the brave heroes of the Photonic Labs. Dozens of Super Robots from the Super Robot Army, including the Jaeger-class Gypsy Danger and the God-classes Godannar and Club Mariner. The advanced Anti-Festum Fafner units of ALVIS and Tatsumiya Island, which had previously been only a rumor and whose technology allowed all pilots to be shielded from Festum mind reading. And finally the legendary soldier Solid Snake himself, aged significantly before his time by a genetic virus he refused to elaborate on.
The Titans were broken up by force, their remnants scattering to the four winds and the Earth Sphere forever free of their evil. Countless aliens died by the Irregulars hands, and for the first time in history a BETA hive (in Yokoshima, Japan) was captured. The Festum's largest Mir (hive-mind crystal for the laymen) in the Arctic was destroyed. Revolver Ocelot's rebellion was ended personally by Solid Snake, and the Katou Organization surrendered and combined its forces with the JUDA Corporation to fight for a common purpose.
But even as old threats were ended, new ones arose. The long shadow of SEELE and the truth behind NERV was revealed by Revolver Ocelot in his final moments, Haman Karn's Neo Zeon returned to the Earth Sphere to continue the bloodshed of the One Year War, and the mysterious Human-Machina began their invasion of Earth from their base inside the moon. Neo Zeon was dealt with without much of note, but when the Hokuten Irregulars made an attempt at invading the hollow inside of the moon, the source of the Human-Machina raids that had been plaguing the world, JUDA's Koichi Hayase and his Linebarrel vanished. Without him, a proper counterattack against the Human-Machina was impossible.
With that first failure as the catalyst, disaster after disaster struck the Hokuten Irregulars.
A Festum assault on Tatsumiya Island resulted in the kidnapping and eventual assimilation of Alvis tactical coordinator Soushi Minashiro, who seemingly perished despite being recovered from the Arctic Mir. The legendary Kouzou Hadou, THE core financier of the paramilitary organization and widely seen as the heart of the group, was brutally murdered by the enigmatic Master Therion, leader of the Black Lodge. Kamille Bidan was rendered comatose in a final duel with Titans leader Paptimus Scirocco, though he made a full recovery two years later, and Lieutenant Quattro (much more famously known as Zeon ace pilot Char Aznable) suddenly vanished afterwards. The Super Robot Army detachment was devastated in a desperate battle to protect the Japanese coast from the BETA. And finally, the group was forced to retreat in the face of Doctor Hell's seemingly endless army of Mecha Beasts, his invasion of Japan only stopped when a desperate last ditch effort by the Photonic Labs crew erected an invincible Photonic Barrier around a huge chunk of the nation, a barrier which remains active to this day.
The result of the Battle of Japan was the final blow to a group already fractured by various internal disputes. The Photonic Labs team and the JUDA-Katou conglomerate remained unified as they stayed behind to protect Japan from the forces seeking its destruction, but the rest of the once-invincible unit scattered to the four winds. The Tatsumiya Island forces returned home for good. Most of NERV's staff defected to form WILLE after Revolver Ocelot's revelations and struck off on their own to hunt down SEELE. The AEUG was reintegrated into the Federation military as an autonomous unit named Londo Bell. The various independent forces that had gathered under the Hokuten flag went back to their lives from before.
The dream was over. While the second formation of the Hokuten Irregular unit didn't end in a Fourth Impact, this final falling out made it almost unthinkable that the group would ever reunite...