S1·E21 He Was Aware that He Was Still a Child.

Kouzou Fuyutsuki is kidnapped and interrogated by Seele, who are horrified over the results of the last encounter with an Angel. He recounts his past, providing flashbacks into the creation of Nerv. The pasts of Misato Katsuragi, Ritsuko Akagi, Rei Ayanami and Yui Ikari are also revealed. Ryouji Kaji, meanwhile, decides to find out the truth, no matter the cost.