Fullmetal Alchemist Vol. 14 (manga)

Ed and Al come face to face with the "father" of the homunculi, who just so happens to be a dead ringer for their own father, Van Hohenheim--a resemblance too uncanny for coincidence. And later, when the allure of immortality proves to be too much for Prince Lin of Xin, he lets Greed take over...literally!