Octonauts (2010)

Name: The Urchin Invasion
Released: 2014-03-21

S3E18 The Urchin Invasion

Mar 21, 2014 Season 3 Episode 18 Animation, Kids

The Octonauts journey to the kelp forest to see Shellington's sister, Pearl, and her new baby, Periwinkle. However, they soon discover that the kelp forest is under threat from a swarm of urchins that are munching away at the kelp!