Perfect Chaos' Attack

Perfect Chaos' attack was a major disaster that occurred in both timelines of Mobius Prime. In both instances, 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 was brought to an end by Super Sonic, who neutralized Chaos' power, turning it back into its base form.

While the nature of the attack and the proceeding rescue efforts where the same in both timelines, minor details still vary.

Pre-Super Genesis Wave
The attack occurred in the year 3236, and lasted for a single day. (StH: #83, #84)

Post-Super Genesis
The attack occurred some time prior to the Shattered World Crisis. The attack was severe enough that the city had still barely recovered before the after mentioned crisis. Most of the exact details of this account are unknown, though it's known that not all of the Knothole Freedom Fighters where present. (StH: #257)