Perfect Chaos (パーフェクトカオス Pāfekuto Kaosu) is a transformation that appears in the Sonic the Hedgehog series. It is the Super State of Chaos, assumed by absorbing the negative energies of the seven Chaos Emeralds. Approximately 4,000 years ago, Chaos assumed this form to destroy the Knuckles Clan and the rest of the world in vengeance, but was sealed away in the Master Emerald by Tikal. In the present day, when Chaos returned due to Dr. Eggman, it became Perfect Chaos again and resumed its rampage until it was defeated and calmed down by Super Sonic.