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A lion's mane jellyfish named Leo accidentally gets sucked in the Octopod and the Octonauts have to untangle his tentacles while Professor Inkling provides backup to small fish that Leo protects. The entire Octopod is flooded with water and Leo's tentacles. The most difficult one is the bubble engine room, where Leo was. Peso objected that it was too dangerous; it wasn't even in the book, so he had to do it all by himself.