Kwazii and Dashi become entangled in a strange deep-sea creature - a siphonophore - and when a geyser blasts it toward the surface, the Octonauts must stop its ascent before it fatally bursts....
The Octopod is grabbed by a colossal squid. The Octonauts are unable to break free due to the hooks on the ends of the squid's tentacles. Fortunately the arrival of some sperm whales turns the squid f...
It's down and dirty time. Splinter is imprisoned. Leo is dying of poison. Don and Usagi are fighting for their lives and the life of the Daimyo against a horde of assassins....