Episode 24 (Directors' Cut): The Beginning and the End, or "Knockin' on Heaven's Door"

Shinji is depressed over the ruin of Tokyo-3 and all his friends who have left. A boy appears nearby who reveals himself to be Kaworu, the fifth Child. They become close friends as Kaworu excels at synch ratio tests. But as suspected, Kaworu is the final Angel and takes control of Unit-02, with Shinji as the only one who can save humanity from being destroyed.