Fullmetal Alchemist Episode 31: Sin
Episode 31 of 51 of Fullmetal Alchemist, aired May 7, 2004, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Izumi has successfully escaped with the boy, but to no avail--Envy had already told the child the truth about himself, and his personality is changing. With all her secrets exposed, Izumi makes plans to atone for her sins. Ed and Al rush to intervene before it's too late.