The Invid Invasion of Earth was a cataclysmic event which occurred in 2031.
History[]
The Invid, after the Flower of Life was stolen and their homeworld of Optera was razed by the Robotech Masters, they divided in two groups, one led by the Regent and other by his wife, the Regess. They sought vengeance, and also the Flower of Life. Soon after the end of the Second Robotech War, they reached the planet Earth, where the Flower had began to grow. They easily took over the planet, wiping out the Army of the Southern Cross, critically weakened by the war, and destroyed many cities. Dana Sterling and the rest of the 15th Alpha Tactical Armored Corps were forced to evacuate from the planet in order to survive and reach of the Robotech Expeditionary Force. However, millions of humans were left alive. Some submitted to the Invid, and other began resistance movements, though not very effective.(Robotech: Love Live Alive, Robotech: Love & War, Part 1, Part 5)
However, mankind didn't accept the Invid occupation, and began a series of attacks to retake their homeplanet. This marked the start of the Third Robotech War.(Robotech: The Shadow Chronicles)