Octonauts Season 3 Episode 18 The Urchin Invasion ( Air Date 2014-03-21 ) Genre Kids, Animation, Action & Adventure category. Overview "The Octonauts head to the kelp forest to visit Shellington's sister, Pearl, and her newborn son Periwinkle - only to find the forest endangered by an infestation of kelp-eating urchins!".
Octonauts Season 3 Episode 18 The Urchin Invasion
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- Watch: Octonauts Season 3 Episode 18 The Urchin Invasion on CWR-CRB
- Stars: Keith Wickham, Simon Greenall, Jo Wyatt, Rob Rackstraw
- Director:
