Dancouga: Super Beast Machine God(1985)

Deep in outer space, the emperor Muge plots his next conquest - an out-of-the-way planet known as Earth. Mustering all the forces of his own personal Empire of Death, the Emperor is by far the most formidable foe humans have ever faced. And now he's even more fearsome thanks to the defection of Shapiro Keats, a power-hungry Earthling reborn as an Empire informer.

Army after army crumbles in the face of an onslaught of the Empire's seemingly indestructible robots. But now there's a team that just might be able to stop them: an ace pilot named Shinobu, Sara (Shapiro's one-time girlfriend), and Ryo, a very unlikely young hero. Together, they're in command of a new weapon developed in a laboratory hidden deep in a lake in Japan. Enter Dancouga, the Super Beast Machine God - and the battle's just beginning!

(Source: Discotek Media)