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. But now there's a team that just might be able to stop them: Shinobu, Sara, and Ryo.