Episode 42: His Name Is Unknown (2003 series)

Synopsis
Scar is set to create the Philosopher's Stone using Archer's soldiers as the final ingredients. Underground, Ed desperately fights to reach the surface in time to stop the massacre.

Trivia

 * This is the first episode of the fourth and final season.
 * This episode marks the death of Scar in this version of Fullmetal Alchemist, as well as the many soldiers transmuted in creating the Philosopher's Stone.
 * It is also worth noting that Scar not only saved Alphonse's life from Kimblee's bomb alchemy as well as the lives of the Reole townsfolk from the military's oppression, finally achieving vengeance against the corrupted military for the downfall of his countrymen, but also gave the Elric brothers what they have been searching for all along - the Philosopher's Stone. Technically, Scar died before he could see his country be rebuild, in contrast to the manga and the Brotherhood anime, where he puts aside his hatred to change the country of Amestris for the better. In addition, he actually survives to the very end of the story where he is offered by the Fort Briggs military to help rebuild his country.
 * During the attack where the army is searching for Scar, a sign is seen on one of the buildings; it says "Mother Land" with "So Feel Good" above it. This could possibly be a reference to the 3rd ending theme of the anime with the same name. The previous episode used this ending theme and was the last to do so before replacing that theme with the 4th and final theme "I Will". This could also be a reference to Rose being the "Holy Mother" of the land and she could be considered as a leader of the land in this sense, though this is rather a stretch.