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The Failed Evangelion Prototypes are the result of Gehirn's unsuccessful early attempts to create a functional Evangelion Unit. Several prototype Evas were made, all of them deemed to be failures. Several dozen prototypes appear to have been built, before they were finally able to build a functional Eva (at least 50 are visible in one shot). The first Evangelion Prototype, which Kozo Fuyutsuki saw in flashbacks in Episode 21, had five eyes. Ultimately, the first successful Evangelion Prototype would be Evangelion Unit-00.
The failed prototype units were scrapped by 2005, ten years before the series begins. The remains of the failed Evangelion Prototypes were subsequently stored in the "Eva Graveyard" located in Terminal Dogma, which according to Ritsuko Akagi was nothing more than a dumping ground for the corpses. By 2015, most of the organic parts of the failed Evas have rotted away, leaving little more than an armored head connected to a spinal column, often accompanied by an incomplete set of malformed limb bones, hinting at their original, perhaps horribly deformed appearance. All of the failed Evas have orange-colored armor on their helmets, similar in design to Unit-00's original orange armor. The word "Reject" is printed on their heads in large red letters.
The Director's Cut of Episode 23 depicted a markedly different Eva Graveyard. In the original version, the skeletons of the failed Evas were laid out on a massive empty floor in a single gigantic underground chamber, with what remained of their limbs carefully matched up with their heads and spines and surrounded by humanoid-shaped chalk outlines. In the Director's Cut, dozens of Eva corpses were simply haphazardly thrown into a pit shaped like the Tree of Sephiroth.
During The End of Evangelion, over a dozen failed Evas are seen, suspended vertically by their heads. The failed Evas seen here display considerable variation in their face structure, some even looking like a human skull (showing the link between Evas and humans). Some also have labels on their spines identifying the vertebrae. Misato drives past these failed Evas in her car as she explains the true nature of the Angels and the Evas to Shinji.