The Urchin Invasion The Octonauts : Season 3 Episode 18
TV-Y Tencent Video 11m
Aired: May 2nd, 2014 @ 8:30 PM EST on Tencent Video
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!
