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The Octonauts Season 3 Episode 18 – The Urchin Invasion Info
The Octonauts Season 3 Episode 18 - The Urchin Invasion Episode Title:The Urchin Invasion.Episode Description:Kelp-eating red sea urchins attack a kelp forest. The Octonauts are helped by Shellingtons's sister, Pearl, another sea otter and scientist and her newborn son, Periwinkle.