Robotech: The Movie.

In 1999 an alien spaceship crashed onto the earth. Hidden on board were the secrets of a unique science known as Robot technology. Databanks found in the ship were transferred to the Earth Robotech Computer Complex. In 2009, an alien search party arrived from hyper-space to reclaim their lost databank. The united Earth Government was forced into an Inter Galactic war. Earth forces were able to win the first battle... but at a great cost. The planet was virtually destroyed. New population centres grew out of the ashes... It is now 2027, a second armada sent by the aliens is nearing earth, they have come to recapture the secrets of their lost technology and then destroy the Earth.