Strong stormy weather can cause flash floods. This is when heavy rain pours down on a region and very quickly floods an area. Scientists are trying to find ways to warn people before flooding hits by studying weather patterns.
The animals from the ice age anticipate the flood thanks to Manny's warnings. While grouped together, the water breaks through the ice dam, causing flooding and large rocks to break from the pressure. All of the animals run to safety.
The dam Plunder built is broken and flooding threatens the villagers. The Planeteers summon Captain Planet, who rushes to the rescue. Captain Planet heats himself up and evaporates the flooding waters into rain clouds, which will rain and restore the river in time.