Perfect Chaos' attack was a major disaster that occurred on Sonic's World. The city of Station Square was attacked by the legendary water beast known as Chaos in its perfect form. The whole city was flooded, and an overwhelming amount of property damage was caused.
The attack occurred at some point before the beginning of the Shattered World Crisis and lasted for a single day. Thought to have been destroyed once and for all aboard the Egg Carrier, Chaos was able to retrieve six of the seven Chaos Emerald from the Master Emerald shrine, before recovering the seventh gem from the crashed Tornado. The beast used the emeralds power to become Perfect Chaos, before dowsing the city in a fierce flood, all before Sonic arrived on the scene. After Eggman's failed attempt to bring down the monster in a second Egg Carrier, Tikal appears, explaining that Chaos is still enraged because of the actions of her people all of those years ago. In an attempt to help the heroes, she used her prayer to suck the emeralds out of Chaos. After learning that Chaos only used the emeralds negative power, Sonic harnessed their "real" power for himself, transforming him into Super Sonic. After a fierce battle, Super Sonic was able to neutralise Chaos, returning it to its base form. Chaos was now happy again, being happily greeted by the Chao he protected years ago. With the monster at peace at last, Chaos returned with Tikal and the Chao to the pocket zone within the Master Emerald. (VG: SA/SADX, StH: #257)
Aftermath and Legacy
Station Square was greatly damaged by Perfect Chaos' destruction, and it took the city a considerable amount of time to rebuild. The city had only just returned to normality when the Shattered World Crisis struck, plunging the unfortunate city into a state of carnage once more. When the Knothole Freedom Fighters arrived in the city to rescue civilians, some of them were disorientated by their conflicting memories, as a side-effect of the Super Genesis Wave, concerning Chaos' attack. In particular, Antoine D'Coolette and Bunnie Rabbot-D'Coolette had recalled being in the city helping out in the rescue efforts at the time, when in reality they were not present during the attack at all. (StH: #257)
- The attack is based on the final story of the video game Sonic Adventure.