- Original release
- Previous episode S03E17 - The Immortal Jellyfish
- Number S03E18
- Country United Kingdom
- Original language English
- Genres Action, Adventure, Animation, Children, Comedy, Family
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External links
TheTVDB page
IMDB page
TheMovieDB page -
Last update
6 juillet 2025 - 16:14
on 11 databases
The Urchin Invasion
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!
Next episode
S03E19 - Hammerhead Sharks
