The crew must catch a runaway Octopod after it is hijacked by a group of crustaceans who are trying to flee an area of seabed being polluted with algae by a broken pipeline.
Tropes:
- Covered in Gunge: Dashi gets covered in algae.
- Green Aesop: The excess algae is caused by pollution via a leaky pipe, so the Octonauts help clear the area and repair the pipe. Later, during the Creature Report, the "Go {creature}!" line is replaced with "Let's clean up!"
- Squick: In-Universe; Dashi is grossed out by all the algae.Peso: (gulp) This is creepy. It's like a ghost town down here.Dashi: Bleh! You mean a gross town!note
