"Zoids: Chaotic Century" is the first two Zoids anime series and consists of Chaotic Century and Guardian Force. Its setting is loosely based on that of Battle Story, and follows Van Flyheight as he meets an amnesiac girl called Fiona and an organoid called Zeke. As the series progresses, Van meets various opponents, such as Raven, and friends, like Moonbay and Irvine, and eventually ends up helping Fiona in her quest to regain her memory and to find a mysterious entity called the "Zoid Eve". Their quest takes them into the thick of an ongoing war between the two factions of the Helic Republic and the Guylos Empire.