Last Day of the Justice Alliance

On March 5, 2028, the Last Day of the Justice Alliance (正義連盟最後の日) came when the forces of evil, primarily made up of the Mycenae Empire's attacking forces led by the Great General of Darkness, besieged the Justice Alliance in six simultaneous battles:
 * A fight between Gamera (Ichirou Tachibana) and his closest allies and the General of Darkness;
 * A siege on the Hall of Heroes in Alexandria, Egypt;
 * An ambush attack on the Alliance in Osaka, Japan;
 * An Alliance-led invasion on the island of Bardos, the capital of the Mycenaean Empire;
 * A battle in the ruins of the Pandora Space against Codename Sherlock, the most powerful Unknown; and
 * An attack on the Justice Alliance Satellite above Earth's orbit by Shangri-La, the leader and strongest of the Zeniths and the mastermind behind the awakening of the Great General of Darkness and the all-out attacks on the Alliance.

In one day, the Justice Alliance emerged victorious against the forces of evil, but suffered incredible casualties in their ranks, including the loss of central leadership and many of the organization's most prominent figures. As a result, the second iteration of the Alliance was dissolved and it would not be reformed until ten years later in 2037.

Casualties and Losses
The devastation of the six battles was great, and saw heavy casualties from both sides. The Alliance saw many superheroes, from low to high-tier, including Gouten Amagami, killed in the fighting, many more such as Ichiro Tachibana, Lily Ramses Futaba and the Goddamn Samurai presumably dead in the fallout of the conflict (only to revealed to be alive years later), and lost much of its leadership afterwards.

Aftermath
That fateful day would be come to be known for several years as the last stand of the Justice Alliance. The Second Alliance, the second incarnation of Alliance that was formed in the aftermath of the Babel War and lasted for four years, was formally disbanded and dissolved. In the span of time from 2028 to 2035, no new superhero faction would come into existence until the Young Braves Brigade's formation, which in part, would give way to the creation of the third and final incarnation of the Alliance, the Third Alliance that also would be called the "Justice Alliance of Earth".