The Octonauts’ mission to explore Antarctica becomes a desperate rescue as a group of sea stars and urchins are threatened by a brinicle – a rare underwater icicle that can freeze creatures on the sea bed. To save the day, the Octonauts use their new vehicle the Gup-S! In other episodes, the Octonauts rescue walrus pups, evacuate creatures living around a reef, and Peso meets a band of insects thought to be extinct.