S3·E18 The Urchin Invasion
Core
Aired March 21, 2014
Synopsis
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!
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Frequently Asked Questions
When did Season 3 Episode 18 of Octonauts air?
Season 3, Episode 18 ('The Urchin Invasion') originally aired on March 21, 2014.
How long is Season 3 Episode 18 ('The Urchin Invasion')?
The episode follows the standard broadcast runtime for Octonauts.
What happens in Octonauts Season 3 Episode 18?
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!...