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| AU =[[Network Ten]], [[Cartoon Network (Australia)|Cartoon Network]]
| NZ = [[Cartoon Network]], [[TV3 (New Zealand)|TV3]]
| UK = [[Sky One]], [[Toonami UK]]
| US = [[Cartoon Network]] ([[Toonami]])
}}
The series follows the story of Van Flyheight, a teenage boy who discovers a mysterious girl named Fiona (Fine in the Japanese version), and an Organoid named Zeke (Sieg). Van discovers that Zeke has the ability to merge with a Zoid, increasing its fighting power, and with that skill, Van and Fiona set off to discover the secrets of Fiona's past. During their travel, they meet up with a transporter named Moonbay, and a mercenary named Irvine, who initially thwarts their progress, but eventually begins traveling with them. As they travel across the Helic Republic, a new war breaks out, with the group of travelers being caught in the middle of it.
===Differences between the storylines===
Although there are many similarities between Chaotic Century and the '[[Zoids#New Battle Story|New Battle Story]]' accompanying the [[Zoids#New Japanese Release|New Japanese Release]], the two storylines are considered to be inherently different, and are believed to occur in alternate continuities. Listed below are the main differences.
*The Zoidian race, known as the Ancient Zoidians in the anime, were wiped out long before human colonists discovered Zi. The event that wiped out the Ancient Zoidians was not the destruction of Zi's third moon by a comet, but the creation of the Death Saurer.
*Both the Guylos Empire and the Helic Republic are based on the Central Continent. No mention of the Zenebas Empire or the Dark Continent of Nyx is made, although Prozen does imply in passing that other continents exist.
*The "Guardian Force" never appears during the Battle Story.
* Certain Zoids are a lot rarer than they are in the battle story. Similarly, the sizes of some Zoids, particularly the Ultrasaurus and Death Saurer, were scaled up dramatically.
==Plot==
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