
When the annual Rainbow River Race is threatened by mysterious whirlpools, Pip and her friends must dive deep into the science of water to save their favorite forest festival. With help from Maya the Oceanic Dream Squirrel and Zazz the River Rapid Squirrel, they'll learn about currents, water pressure, and flow dynamics - all while trying to keep Thornok from turning their beloved river race into a dangerous disaster!
Pip excitedly signs herself and reluctant Rubes up for the Rainbow River Race, where they meet Maya and Zazz. Strange whirlpools begin appearing in the river, suggesting something is wrong.
At an emergency meeting, Maya explains how natural water currents should work. Thornok appears, suggesting the race should be cancelled for safety. The Fuzzwuzzes decide to investigate the whirlpools instead.
The team explores underwater with help from Glowleaf and Pearlpop, discovering Thornok's devices planted along the riverbed.
Master Momentum teaches them about flow and momentum using the Bouncing Bamboos as a model for understanding water movement.
Salty teaches them about water pressure while Torrent helps them develop practical techniques for navigating dangerous currents.
The race begins and Thornok activates his devices, creating dangerous whirlpools throughout the river. The team tries to implement their counter-strategy.
The team realizes that chaotic, unpredictable movements disrupt Thornok's precisely calibrated devices, leading to a spectacular counter-attack.
Beany arrives and transforms Thornok's devices into harmless crystal art. The Fuzzwuzzes celebrate their victory and the lessons they learned about working together.