Gravion - 12

The year is now 2041 AD. A new enemy called Zeravire suddenly appears in the solar system, destroying all military installations it comes across. However, a wealthy Klein Sandman knows this planned invasion and has secretly prepared his army for battle. His trump card is Gravion, a giant robot that utilizes gravity as its energy source. Meanwhile, a young man named Eiji secretly enters Sandman's base in search of his missing sister. It is there that he meets another young man by the name of Toga... These two must now fight with four other individuals aboard the super robot, Gravion, to fend off the Zeravire threat.