The Octonauts and the Octopod Mystery is a episode of Octonauts Season 4.

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When the Octopod starts to break down, Tweak must pick up the bubble converter in a strange place only Barnacles and Inkling know - The Old Octopod. It is said that it is a failed version of the other Octopod, When they get there, They realize that they are not alone.......

Episode Guide

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Next: Octonauts and the Baby Sea Turtles