Gravion is a tV series anime that premiered in fall 2002, produced by GONZO.

About the production: the story comes from an original script, there are 13 episodes of about 23 minutes and its current status is "finished".

Its main genres are adventure, comedy, mecha and sci-fi, with themes such as Aliens, War, Artificial Intelligence and Male Protagonist.

On AniList, Gravion has an average score of 61%, an average score, and appears on 4,463 users' lists.

The franchise continues in or follows from: Choujuushin Gravion Zwei.

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. (Source: Anime News Network)

Official synopsis from AniList.