Human-Karik war

The Human-Kar war was a global conflict between humanity's United Nations and the Karik Empire that invaded mankind's homeword for apparently expansionist reasons.

Earth's global military was able to somewhat counter the invading empire's forces, but ultimately stood no chance of victory due to severely less advanced technology and air inferiority. The United Nations eventually capitulated, which resulted in the effective extinction of the human race until four hundred years later, when the species was restored.