Space Gundam V(1983)

"Sigma Star, a galaxy with a highly developed civilization, is ruled by its ruler, General Uranus, who dispatches his subordinate Hades to Earth under the pretext of preserving cosmic order. But Hades thinks that the Earth must be destroyed, but the heroic Dike disagrees. However, Hades's words are accepted, and a group of monster robots attack, putting Earth on the brink of destruction... Until Dike's reveals Gandam V! Finally, the super-special fortress Gandam V, capable of transforming into a three-stage weapon, is deployed and repel all space invaders." - Korean DVD description