Chaos Zero is a major antagonist in the Sonic the Hedgehog series, specifically in 'Sonic Adventure.' Known as the 'God of Destruction,' Chaos Zero is a powerful, water-like creature formed from the energy of the Chaos Emeralds. As the guardian of the Master Emerald, he originally protected the Chao, but was driven to rage by the actions of others. His transformation and rampage drive much of the conflict in 'Sonic Adventure,' making him a memorable and formidable foe for Sonic and his friends.