After a mysterious murder takes place in the streets of Amestris. The Elric Brothers hunt for the Man Who Laughs, along with other characters from the cape and cowl days. With the Homunculus and the new enemy surfacing, who will be the victor in this all out war?

This is a crossover between Batman the Animated Series and Full Metal Alchemist, and FMA Brotherhood. the only character that's just from the Nolanverse is Dr. Crane aka Scarecrow played by Cillian Murphy.

They told him his life before the dark halls of Arkham was a lie. The only solice he had was in the maddness of the Rouges, and the faith of a plant.