Getter Robo: Armageddon-1

In this world, a lot of terrible things happened. Dr. Saotome seemed to have gone insane and created Shin Getter Dragon: a great machine whose power was unrivaled, but when the UN Security council tried to destroy it with a proton bomb the results were catastrophic. Getter Rays flooded the world, making shapeshifting creatures known as the 'Invaders' insanely powerful and reproduce at a heightened rate. Humanity started facing a losing battle as the Getter Pilots were scattered, Shin Getter Robo disappeared, and Shin Getter Dragon itself disappeared. In this world, a world destroyed by the Getter Rays, now finds that its only hope is in the technology that helped damn it.