Zoids Chaotic Century Anime Summary:

Deep in the Milky Way is a planet known as Zi, with two moons and an environment much like Earth's. Once long ago, an ancient civilization (Zoidian's) created biomechanical mechs they called Zi-oids(but known as Zoids for short). Their race has since disappeared, but the Zoids they left behind still exist, and they have become the focus of conflict.

The story takes place during a titanic war between the two greatest nations on Zi: the Guylos Empire and the Helic Republic. Into this chaos enters three different yet connected lives: Van Flyheight, a young Republican who stumbles upon some ancient ruins; Zeke, an Organoid in the ruins who has the capacity to revive and maximize the potential of Zoids; and Fiona, an ancient Zoidian awakened from her sleep and who now accompanies Van on his journey into destiny. With the help of the crazy Dr. D, the mercenary Irvine, and the independent Moonbay among others, Van inadvertently finds himself on a course to stop the war before it takes a disastrous turn and to find the mystery behind Fiona's past & the "Zoid Eve".