Berserk

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Eva 01's mouth opening when it goes berserk

Eva 01's forcibly tearing open its wired-shut jaws

Berserk (暴走, bousou) is a state an Evangelion can enter into in which it has gone beyond Nerv's ability to control it, entering into a savage battle-frenzy in which the Eva's strength and ability levels drastically increase. In most cases, a berserk Evangelion can, inexplicably, continue to function even after her internal batteries have been drained, i.e., remain operational beyond the established time limit. Characteristically, an Eva that enters "berserker mode" will savagely tear open its wired-shut jaws. This is frequently accompanied by the Eva howling wildly like an animal.

During these incidents, the Eva's resident soul appears to bypass restraint mechanisms and wield her own body, although it's arguable how much "conscious control" the soul has over the Eva's actions. (The discrepancy between the behavior of Yui Ikari — prior to her "death" — and her Evangelion incarnation is often cited to this effect.)

"Berserker mode" operates in defiance of the current level of human scientific knowledge, and as Dr. Ritsuko Akagi says of the Angels in Episode 04, Nerv is truly dealing with beings beyond the grasp of modern science's comprehension. Ritsuko is aghast when Eva-01 goes berserk in Episode 16 with its internal batteries completely drained, and in Episode 20 it is revealed that no known power source could be detected during the incidents when the batteries were drained. Nerv is very aware of the danger an out-of-control Evangelion poses and is extremely concerned about keeping the Evas bound and restrained at all times. No attempts at artificially initiating a true berserker mode have ever been made, although the use of the Dummy Plug in Episode 18 results in a seemingly similar state of greatly increased strength and savagery.

While the fullest extent of berserker mode is when an Eva loses control and continues to function, even after its umbilical power cord is severed and its internal power limit has been exceeded, there are several instances of

Eva-00 has two incidents (in Episode 05 and Episode 14), both occuring when a pilot attempts to synchronize with her for the first time. During her activation test with Rei Ayanami, the Entry Plug is auto-ejected (apparently by the Eva herself) and Eva-00 continues to move undeterred until her power runs out. The second incident, involving Shinji Ikari, is extremely similar, except the Eva rejects the auto-eject signal. This prompts a cryptic comment from Ritsuko, "Is it going to try to absorb Shinji?" It is not clear, however, due to these circumstances if the two incidents of Eva 00 losing control should strictly speaking be considered true "berserker mode", and not simply Eva 00 "losing control". Case in point, Eva 00 turned off after its normal internal power supply ran out, which a "berserk" Eva would have been able to keep functioning beyond.

Eva-01 is the most notorious "berserker". Her abilities to move both independently and without power are effectively established before her initial activation, when she moves her arm to shield Shinji from falling lights (in spite of being loaded with a signal Termination Signal Plug). Not long after, she goes out of control during her first sortie, against Sachiel, exhibiting a bestial and uncompromising "battle rage" that doesn't stop until the Angel is down. Similar behavior occurs when Eva-01 brings about Leliel's gruesome destruction, and, later, mauls and devours Zeruel, although, unlike the incident with Sachiel, these both occur when her internal batteries are fully drained. In Episode 25', Eva-01 moves independently once more, and seems to be effectively in control of herself from that point forward.

Eva-02, after being ravaged by the Mass Production Evas, briefly goes berserk and moves without any power supply, moments before its destruction. This instance is unusual, in that Asuka is shown piloting, rather than control being clearly deferred to the resident soul (Kyoko), the only one who should be able to access that type of higher Evangelion ability (according to the precedent established with Eva-01). It is possible that this is because, as Asuka herself proclaimed, she by that point had fully realized that her mother's soul was inside of Eva 02, "watching over" her, and was thus able to integrate her actions with those of her mother's soul. Shinji, by comparison, did not fully comprehend that his mother's soul was contained in Eva 01 during the battles against Leliel and Zeruel, etc.

Notes

• Bousou literally means "out of control". "Berserk(er)", however, is the official English rendition, as indicated by the document Shiro Tokita displays in Episode 07.
• When controlled by the Dummy Plug system in Episode 18, Eva-01's behavior is indistinguishable from her true "berserker mode".