~Name: Seikin (translated roughly as "Genesis" in English)
~SGC Designation: P18-E11
~Primary Ethnic Group(s): Japanese, Germanic/Celtic, Gaelic, Cantonese, Vietnamese, Slavic, Mongolian, Persian, Arabic, Hindu, Egyptian, Grecian, Roman, Hebrew.
~Major Nation(s): Nihongo, Etnos Akratias ("Unanimously Governed States"), Hessian, Gauland, Unicameral, Neuria, Aryanas.
~Technological Level: 20+ years Modern Earth (not including Evangelion-derived tech)
~Political System: Capitalist semi-Collectivist Democracy (actually a crypto-fascist regime under the organization SEELE)
~Population: 2.8 billion
~Dominant language(s): Nihongese (evolved form of Ancient Japanese with some Romantic influence)/Etnogish (Romantic/Germanic language with Catonese influence, somewhat similar to Glosa on Earth). Ancient (an early version of Latin) is also used, but only by SEELE and select NERV personnel. Goa'uld is still spoken in a number of remote regions.
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Approximately three point five million years ago the Alterran cityship now known as the 'Geofront' landed on the planet Genesis. Judging by the planet's relative position and datafile in the Ancient Database, it served as the "Eastern Capital" world of the Alterran's Milky Way empire. Stationed facing the Sol system almost directly across the Galactic Core, it was a center of commerce, diplomacy and scientific discovery.
However, after nearly 400,000 years of peace and prosperity, the second wave of the Ori plagues hit the Ancients, most likely sent from the Ori home galaxy via Stargate. The Alterran city-ship Atlantis evacuated all those not-affected within Earth's range and left for the Pegasus galaxy, while the Geofront and the Eastern half of the Alterran Empire tried to battle the plague as best they could.
Dozens of attempts to cure the plague were attempted, from time machines, to galactic terraforming systems. Ultimately, the largest and most ambitious project was undertaken on Genesis, a program the Ancients codenamed "Third Impact".
Third Impact would have partially ascended all life in the galaxy through the Stargate network, into a form of primordial "soup". Again through the Stargates this soup would be drawn to Genesis and reformed into a singular superbeing, free from death, starvation or human suffering. It was felt that this would be the final step in the Alterran's evolution. Eventually, the plague's spread soon reduced the Third Impact team to seventeen scientists/volunteers, fifteen of which attempted small-scale versions of Third Impact on themselves. They were able to evolve themselves into several different, advanced forms of humanity, all partially-ascended and immune to the Ori's plagues. However, they could not achieve the same thing on a planetary, much less galactic scale. The leader of the project, codenamed Adam, theorized that fusing himself with one of the other volunteers while ascending, and dialing every Stargate in the galaxy simultaneously, could provide enough raw power to initiate the transformation. Unfortunately, his first attempt with his mate (codenamed "Lillith") backfired, reducing all of the partially-ascended Ancients to embryotic stages of their current forms, and twisting Adam and Lillith into huge, partially-ascended monsters. The Alterrans would later call them "Angels", which in their language translated to "messengers of failed gods".
In a mad rage Adam attempted to destroy Genesis and all the Ancients left on it, before trying to finish what he'd began by spreading Third Impact to the rest of the galaxy. Lillith and other Ancients managed to capture him in a huge containment system at Genesis's southern pole, but it was found that Adam would not be held for long as he was. Lillith volunteered to imprison herself in a similar containment vessel in an area of Genesis now called Nihongo. In Lillith's case, however, the raw energy her body produced as a result of her transformation would serve as a counter-balance to Adam, keeping both imprisoned (hopefully) forever. The fifteen other partially-ascended Ancients were placed in specially-prepared containment vessels of their own all over Genesis before the Ancients finally abandoned the world, to be awakened in case Adam was ever freed in order to support Lillith against him.
Over three million years later, in the Earth year 2,800 BC, the Gou'ald discovered Genesis. It was very similar to Earth, but much closer to the Gou'ald holdings on the other side of the galaxy. Therefore, a number of Gou'ald used the planet as a "ranch", bringing large groups of humans to different parts of the planet to be bred into potential hosts, Jaffa, or slaves. A group of humans on Nihongo discovered the Geofront, interpreting it's existence as proof that the Gou'ald were not their true gods. This group of humans formed an organization known as SEELE, and over the course of two hundred years learned how to operate the Geofront's weapon systems and drive the false gods from Genesis.
Millenia passed. The humans on Genesis created nations and empires, based upon the cultures they were originally from. They grew and warred with eachother, forgetting the Goa'uld, all the while SEELE unlocked more and more of the secrets of the Ancients. SEELE read the history of the Alterrans, and of the goals of the Third Impact project. They looked around at the people on their world fighting and dying, and decided to try and finish what the Ancestors had began. Behind the scenes they took power, manipulated the politics of their world, until they developed sufficiently advanced technology to explore their planet's southern pole. SEELE sought to free Adam so that they could begin Third Impact.
Unfortunately, in their arrogance their scientists released Adam, causing a catastrophic explosion known as "Second Impact". First Impact was Adam's rampage, the remaining evidence of it's occurance being chalked up to a natural disaster over three million years ago that supposedly let humans evolve on Genesis. Adam's power, held in check by the containment system and Lillith for so long, was released uncontrollably. It left Adam as a primitive embryo, much like the other Angels. The containment system had been designed to revive the other Angels if Adam had been freed, but it only had enough power to restore one at a time to their full strength. Also, as Adam was reduced to an embyro like the other Angels, the system did not regard him as an immediate threat. If however, Adam was returned to full power and attempted Third Impact again, the Angels would be awakened and would move to stop him.
SEELE, aware of this thanks to the Geofront database, decided that this was not acceptable. Using their infleunce behind the scenes, they created the organization Gehrin (later renamed NERV) with financial support from the primary nations on Genesis with the goal of preventing another disaster like Second Impact. In reality, NERV's true goal was to facilitate SEELE causing Third Impact (codenamed the Human Instrumentality Project), through the use of biomechanical versions of the Angels cloned from Lillith (still held within her containment vessel beneath the Geofront) and Adam (recovered from Genesis's southern pole). With these Angel clones (named Evangelions) piloted by human children (as Second Impact had caused every child born thereafter to possess an ATA, or Ancient Technology Activation gene), SEELE and NERV hoped to lure each Angel to the Geofront one at a time to be killed, so that they could not interfere with Third Impact.
14 years after Second Impact, NERV was able to use Lillith's containment vessel to send a false alarm to the Angels, essentially indicating that Adam was trying to break into the Geofront to join with Lillith and enact Third Impact. The Angels began to be sent, one at a time due to power restraints, and one by one they were killed, unable to warn their siblings of the trap awaiting them. SG-1 made first contact with NERV through the Geofront's Stargate after the defeat of the Eighth Angel, and were observers for the most part up to the final battle. They were able to uncover the truth of NERV and SEELE's mission, and with the help of the Eva pilots tried to prevent Third Impact. SG-1 was successful in keeping 3I from spreading through the Stargate network to the rest of the galaxy, but were unable to prevent the event on Genesis itself. The massive energy release destroyed Genesis's biosphere and halted all geological activity in the planet, as it transformed every living person on the surface (aside from those within Evangelions) into partially-ascended primordial "soup". This "soup" was gathered up in the hands of a new, partially-ascended being formally known as Rei Ayanami, who had grown to an enormous size after fusing with Adam's embryo and Lillith.
It was Shinji Ikari, the pilot of the Evangelion Unit 01, who was able to abort Third Impact by giving every person who became part of the partially-ascended superbeing the choice to stay within Instrumentality, or leave it. Of the billions who entered Instrumentality, only a few thousand (including SG-1) have left so far. The SGC has helped the survivors colonize a new homeworld called Shin Seiken (Neo-Genesis), and have set up Genesis's Stargate by the so-called Dead Sea of partially-ascended humans, so that every person who chooses to leave Instrumentality can simply dial Neo-Genesis and rejoin their friends and family.
As for the records and files on the extraordinary events that occurred on Genesis, most were destroyed in SEELE's assault on the Geofront just before Third Impact. The only known video recordings of Third Impact itself, taken from the SGCS Columbia sent to Genesis to help SG-1, have since been classified top secret by the SGC. All additional records, documents, and files related to SEELE, HIP and Third Impact have been confiscated by the US military. As for the Evangelions, it is known that at least one mass-production model was sent to Area 51 for study. The fates of the other thirteen units remains top secret.