Berserk

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 in which it has gone beyond Nerv's ability to control, characterized by a battle-frenzy in which the Eva's strength and capabilities drastically increase. Those Evangelions with jaws bolted shut force them open and bellow wildly during berserker mode, and show savage, animalistic tendencies in their movement and behavior.

"Berserker mode" operates in defiance of the current level of human scientific knowledge, and Dr. Ritsuko Akagi is aghast when Eva-01 goes berserk in Episode 16 with its internal batteries completely drained. In Episode 20 it is revealed that no known power source could be detected during the incidents (the second in Episode 19) when the batteries were drained. It is not known what is powering Eva-01 during these incidents, but there must be some limit to it, or else consuming Zeruel's S² Engine would have been unneccessary.

During these incidents, the Eva's resident soul appears to bypass restraint mechanisms and act on its own. Some have argued against this, citing the discrepancy between the known behavior of Yui Ikari prior to her "death" — and the savagery of her Evangelion incarnation. This could, however, be attributed to the fact that she is a mother protecting her child.

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 berserker mode have ever been made. (The use of the Dummy Plug in Episode 18 results in a seemingly similar state of greatly increased strength and savagery, but as the Dummy System, not the resident soul, is in command this is not a berserk incident.) Several incidents of increased strength, savagery, or battle rage have been displayed by Evangelions, in addition to the unpowered berserker mode.

Berserker behavior by individual Evangelions

The Series

Evangelion Unit-00

Eva-00 has two incidents (in Episode 05 and Episode 14), both occurring when a pilot attempts to synchronize with it. During the activation test with Rei Ayanami, the Entry Plug is auto-ejected (apparently by the Eva itself) and Eva-00 continues to move undeterred until its power runs out. The second incident, involving Shinji Ikari, is extremely similar, except the Eva rejects the auto-eject signal. Unlike the Eva-01 incidents, in both of these cases the Eva shut down after it ran out of internal power, and did not restart using whatever power moved Eva-01 during its berserk incidents.

Evangelion Unit-01

Eva-01 is the most notorious berserker. Its abilities to move both independently and without power are effectively established before its initial activation, when it moves its arm to shield Shinji from falling lights (in spite of being loaded with a Signal Termination Plug). Not long after, it goes out of control during its 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 umbilical cable is disconnected and internal batteries fully drained. Shinji is not involved in any of the berserk incidents, being blacked out in the first two and dissolving into LCL in the third.

In Episode 25', Eva-01 moves independently once more, setting off a crucifix-shaped explosion and growing "wings of light". From this point forward, Eva-01 seems to be completely under Yui's control.

When controlled by the dummy system in Episode 18, Eva-01's behavior is very similar to berserker mode, but as its actions were directed by the Dummy System itself, not the resident soul, this is not a berserk incident at all.

Evangelion Unit-02

Eva-02 sets off a crucifix-shaped explosion and goes into a battle rage in Episode 25', performing incredible acrobatic feats and casting an offensive A.T. Field against attacking JSSDF units. After losing all battery power (the umbilical cable was destroyed by the JSSDF) and being ravaged by the Mass Production Evas, the Eva goes berserk and briefly moves without any power supply before its destruction.

Eva-02's berserk is different from those exhibited by Eva-01 and Eva-00 previously because the pilot, Asuka, appears to be in primary control of the Eva throughout. She may have willed the Eva into moving without power, having fully understood that the soul of her mother, Kyoko is inside. However, the fact that the Eva vocalizes during the JSSDF battle and while moving without power, which up till this point has occured only when the berserk Eva's soul has taken command, suggests to some that Kyoko has actually taken command, although this is heavily disputed. It is not known whether Eva-02 is mimicing Asuka, or Asuka is mimicing Eva-02, or if it is some sort of joint effort.

Evangelion Unit-03

Eva-03 was infected by the Angel Bardiel during activation and initially behaved very much like Eva-01 in its first berserk incident, breaking open its jaws and bellowing, although this appears to have been the work of the Angel itself and not the resident soul. Despite being heavily mutated by the Angel, Eva-03 was ripped apart by a Dummy Plug controlled Eva-01, so the Angel appears to have been unable to harness the Eva's latent power and strength.

Rebuild

Evangelion Unit-01

Evangelion 2.0 shows Eva-01 entering a berserk-like state against Zeruel, signified by its eyes and neon green trim turning red. In this state, the Eva demonstrates several Angelic abilities including an extremely devastating energy attack from its eyes, reforming its severed arm from its AT-field then further morphing it into geometric shapes (not unlike Ramiel's transformations from) before releasing a powerful shockwave and at the top of its power, manifesting a halo. Unlike in the series, Eva-01 doesn't devour Zeruel but rather establishes contact between Shinji and the Angel, allowing him to extract the soul of Rei Ayanami from the Angel's core before the Eva ruptures it and absorbs the fluid the Angel has turned into. After absorbing the Tenth Angel, Eva-01 receives a massive increase in power and turns into a glowing energy being, almost setting off Third Impact before being impaled and deactivated by the Mark.06's weapon.

This incident is distinctive in that the Eva is depicted as under the pilot's control for most of its duration, despite having many characteristics of a berserk incident. When Misato asked Ritsuko if Eva-01 has gone berserk, Ritsuko as unable to provide an answer. Whether or not Yui played some role in the events is disputed and remains to be seen.

Evangelion Unit-02

The Beast Mode activated by Mari in Eva 2.0 resembles a berserk in many ways, but does not qualify since the Eva is not actually out of control.

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.