The Moore Brotherhood receives reinforcements from the Earth Federation, but the new mobile suit pilots are young teenagers, much to Io's chagrin. Feeling the pressure of the war, Claudia resorts to drugs before Io snaps her out of an overdose. Io leads the young cadets to break through the Living Dead Division's final defenses, but the battle becomes a massacre due to the young pilots' inexperience.
Federation troops and Zeon forces carry out a fierce battle in the Thunderbolt Sector in what was once Side 4 "Mua". The Thunderbolt Sector is a shoal zone composed of the debris of destroyed space colonies, named for the electrical discharges from the metal debris. MS pilot Io Flemming is among the Federation soldiers who are dispatched to the area, where Zeon sniper Daryl Lorenz awaits them on the battlefield.
