Zoids: Chaotic Century (1999)

Set on the distant planet Zi, the story unfolds in a world where biomechanical creatures called Zoids serve as powerful weapons in the long-standing conflict between the Helic Republic and the Guylos Empire. A fragile ceasefire holds, but rising tensions and the return of ancient Zoidian technology threaten to plunge both nations back into war. The story follows Van Flyheight, a young boy who discovers Fiona, a mysterious girl with no memory, and Zeke, an Organoid capable of enhancing a Zoid’s combat abilities. Traveling with the resourceful Moonbay and the reserved mercenary Irvine, the group searches for clues to Fiona’s past. Their journey leads them across the Republic and eventually into the heart of a renewed conflict that will shape the future of Zi.