}} is a video game character and the main antagonist in the video game Sonic Adventure for the Sega Dreamcast. Chaos is the first main antagonist of a Sonic game that is not Doctor Eggman. This eventually became common in the 3D games, with Eggman's role as the main villain being replaced by other villains (though often Eggman still makes an appearance). Chaos is an immortal, ageless god-like creature (referred to as the "God of Destruction" by Eggman) that seems composed almost entirely of wate