The Immortal Legion

The unnamed general who releases the Mannequin Soldiers is devoured by his own creations, along with the scientist who tries to gun them down. Below Central Command, Edward's group reaches the enormous door to Father's lair, the very place Alphonse had described. Jerso spots a decayed body and armor that Edward identifies as Barry the Chopper, and when the door opens on its own, the Mannequin Soldiers pour out.

Elsewhere Olivier drags a wounded general as her hostage and forces him to order the gates sealed against Mustang and the Briggs troops. Mid-command, Sloth appears and crushes the general flat, and Olivier calmly thanks the homunculus for the favor before bracing to fight him.

When one Mannequin murmurs "Mama," Edward recognizes that these creatures carry human souls, and the group commits to keeping them from reaching the streets. Above them, Buccaneer battles Central's forces while Mustang's team seeks a new route through the chaos. At Alphonse's dome, Heinkel deciphers Pride's tapping as military code betraying their position, but before Alphonse can silence it, Kimblee strikes, wounding Heinkel and breaching the shell.

Underground, May flees the pursuing Mannequins until her jar shatters and Envy is swallowed by one of them, seizing its body and restoring his monstrous form before reverting to human shape. At the dome, Alphonse severs his own armored feet to escape Pride's shadows. Meanwhile Sloth binds Olivier until Alex arrives and knocks the homunculus back. Heinkel, refusing to be left behind, gives Alphonse the small Philosopher's Stone he salvaged from Baschool, and the boy repairs his armor and emerges renewed.

The episode draws on the manga chapters covering the army of immortals, the reunion of alchemists, and everyone's combined strength. It opens the fifth and final season and debuts SID's opening theme "Rain" alongside Shoko Nakagawa's closing theme "Ray of Light." Its depiction of Barry the Chopper introduces a continuity oddity, showing his head sliced in half and his remains relocated, and giving Edward more knowledge of the man than he should plausibly possess.