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The Octonauts head to a kelp forest full of kelp-eating urchins!
A sea sponge suffers from a mysterious illness.
Some old friends help Shellington and the crew try to gather some skittish crabs. The Octonauts must stop a huge herd of Sea Pigs before they march blindly into the Mariana Trench!
The Octonauts mission to explore Antarctica becomes a desperate rescue as a group of sea stars and urchins are threatened by a brinicle - a rare underwater icicle that can freeze creatures on the sea bed.
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- Premiered: October 4, 2010
- Rating: TV-Y
- Premise: A band of explorers roams the oceans in this animated adventure series. (more)