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A new and extremely bizarre Angel appears in the sky over Tokyo-3, apparently a black and white sphere. All three Evangelions move in to attack, but Shinji’s attack is useless and he and Unit 01 are absorbed into a growing shadow that has engulfed the city. Ritsuko determines that the Angel exists on a higher dimension of existence, which can only be explained by mathematical concepts: the “shadow” on the ground, described as being 600 meters wide but only 3 nanometers thick, is the actual body of the Angel, and the sphere in the sky is its shadow. Fearing that Unit 01 has been completely lost, NERV prepares to drop all of its remaining N² bombs into the Angel, hoping that this will destroy the Angel even though it could easily kill Shinji as well.

While trapped in the Angel, Shinji goes on an introspective mental journey. As Unit 01’s battery power completely drains and life support runs out, Shinji falls unconscious, and a pair of glowing arms reach out to embrace him. Outside the Angel, Misato and Ritsuko witness Unit 01 violently tear its way out of the Angel’s shadow, killing it.
-wikipedia.org

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