A cone snail somehow boards the Octopod, and Peso is the only one who can free it and save his crew.
Tropes:
- Artistic License – Biology: In real life, just a few microliters of cone snail venom is strong enough to kill ten humans. Imagine what a whole harpoon would do to a house cat, dachshund, sea otter, and bunny.
- Bait-and-Switch: When the cone snail shoots its harpoon at Peso, it looks like he got stung. Turns out he wasn't stung, and the harpoon got the manual instead.
- Dwindling Party: Non-death example (obviously), but one by oneOrder , all of the Octonauts but Peso get stung by the cone snail and are put out of commission until the end of the episode.
- Involuntary Smile of Incapacitation: After the titular cone snail harpoons Kwazii in the hand with a toxic stinger, Kwazii starts smiling and chuckling.