Episode 45: A Rotted Heart (2003 series)

Synopsis
Ed proves he will do whatever it takes to stop the Homunculi -- even defile his mother's grave. Back in Central, Colonel Mustang decides to challenge the entire military leadership on his own.

Trivia

 * Ed's disguise of a large hat, circular glasses & large overcoat, bears a striking resemblance to the trademark costume of Alucard, protagonist of the Hellsing anime/manga series.