When the Octopod is attacked by a colossal squid, the ship is dragged down to an abyssal trench, forcing Captain Barnacles and Kwazii to make a perilous swim outside to confront the gigantic beast. Will the Octonauts free themselves from the colossal squid's tentacles? It'll take all the gups, Professor Inkling in a tentacle suit, and some polar bear strength! Yeow!