Season 1
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 man named Klein Sandman is already aware of this planned invasion and had been secretly preparing his army for battle. His trump card is Gravion, a giant robot that utilizes gravity as its source of energy. Meanwhile a young man named Eiji secretly enters Sandman's base in search for his missing sister. It is there that he meets another young man by the name of Toga... These two must now fight together with four other individuals aboard the super robot, Gravion to fend off the Zeravire threat.
Episodes
1 Fortress of the Diety Oct 8, 2002 
2 Mission of Gravity Oct 15, 2002 
3 Labyrinth Oct 22, 2002 
4 The Princess in the Tower Oct 29, 2002 
5 The Girl Who Wouldn't Laugh Nov 5, 2002 
6 Toga's Day Off Nov 12, 2002 
7 Drill Girl on the Beach Nov 19, 2002 
8 Storming the Castle Nov 26, 2002 
9 A Distant Embrace Dec 3, 2002 
10 Crack Dec 10, 2002 
11 The Thing That Was Lost Dec 17, 2002 
12 Because You're With Me Dec 24, 2002 
13 White Steel Fang Dec 31, 2002