Choujuushin Gravion  

Gravion, Super Gravity God Gravion, Super Heavy God Gravion, 超重神グラヴィオン

In 2041 ad, a new enemy known as zeravire emerges in our solar system and destroys all military installations it encounters. however, klein sandman had been secretly preparing for this invasion by building up his army. his strongest weapon is gravion, a giant robot that harnesses gravity to generate energy. meanwhile, eiji searches for his missing sister at sandmans base, where he meets toga and they must work together with four other individuals on board the powerful gravion to defeat zeravire.