Fullmetal Alchemist: Brotherhood - Season 1 Episode 40 Homunculus (The Dwarf in the Flask) Humankind cannot gain anything without first giving something in return. To obtain, something of equal value must be lost.
Overview: Long ago, the blood of a simple slave was used in an experiment which created a strange, shapeless being. In exchange for the gift of existence, the being gave the slave a name - and cursed him with immortality.