Neon Genesis Evangelion

Rei III (Director's Cut) (1x29)

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Asuka sinks into deep depression after Arael's mental probing, and is unable to pilot when the new Angel Armisael arrives. Armisael begins physically fusing with Eva-00 and threatens to do the same to Eva-01, prompting Rei to sacrifice herself to save Shinji, only to appear alive soon afterwards. Under threat by Misato, Ritsuko opens the door to a room in Terminal Dogma to reveal the dark truth about Rei Ayanami.