Shin Seiki Den Mars
Genres: Sci-Fi
Type: TV, Episodes: 13
Aired: Oct 31, 2002 to Feb 6, 2003
Studio: Plum, Studio Guts
Source: Manga
Rating: PG-13 - Teens 13 or older
Synopsis:
Mars is discovered on a forming volcano island, Heisei; a man with no memory. In reality, Mars is from outer space, and is supposed to gather information to decide whether Earth should be destroyed or not. Along with the giant robot Gaia, and his mysterious images of a woman urging him not to destroy the world, Mars decides to fight for Earth rather than destroy it, even if it means fighting his own kind. But if Mars is killed, Gaia will explode, destroying Earth along with it.

(Source: ANN)