Episode 45: A Rotted Heart (2003 series)

Synopsis
The confrontation between Hohenheim and the leader of the Homunculi continues, and the Elrics finally "truth behind truths." As Al receives a mysterious phone call, Ed proves he will do whatever it takes to stop the Homunculi—even defile his mother's grave. And back in Central, 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.