Human Eradication Army

The Human Eradication Army is a Beastmen organization formed by Lordgenome and led by the Four Supreme Generals, serving as the antagonists for the first half of Tengen Toppa Gurren Lagann. Its purpose is to keep the humans underground in order to prevent the human population from reaching one million and triggering the Anti-Spiral's Human Extermination System.

Members of the organization pilot Gunmen, which were originally designed to combat the Anti-Spiral. Its ranks are divided into four divisions, each led by a Supreme General, that patrols a separate sector of the planet to eliminate any humans who reach the surface.

Before Beastmen War Arc
After the Spiral War ended in the destruction of the Spiral forces and the Anti-Spiral's triumph, a Spiral Extermination System was set up over Earth, as with other planets that contained spiral beings, to exterminate all life on Earth if the human population ever reached one million.

So as to keep humanity's numbers below the limit in order to ensure the Anti-Spirals would not wipe them all out, Lordgenome turned on his human comrades and began the push to drive them underground. He engineered a new race called Beastmen, incapable of producing Spiral Energy, and established the Human Eradication Army, a Beastmen military force whose purpose was to slay any humans who reached the surface, in order to keep humanity's numbers low so the Anti-Spiral would not retaliate again.

Beastmen War Arc
However, eventually, a sizable resistance force was formed to combat the Human Eradication Army called "Team Dai-Gurren", founded and led by Kamina and later by his "little bro" Simon. Team Dai-Gurren fought the Human Eradication Army all the way to their capital city of Teppelin, where Simon killed Lordgenome, the Spiral King, ending the war and allowing humanity to reclaim the surface once again.

Anti-Spiral War Arc
After the deaths of Lordgenome and the Four Supreme Generals, the Human Eradication Army went defunct as a new human civilization was established on the surface of the planet. Beastmen warlords who were former members of the Human Eradication Army would continue to wage war against human settlements, though most were eventually eliminated by the New Government with their Grapearl squadrons.

Members

 * Lordgenome - Founder / Spiral King
 * Four Supreme Generals
 * Guame
 * Cytomander
 * Adiane
 * Thymilph
 * Viral - Vice Commander
 * Jirid
 * Commander Dusack