But will they triumph as this time their arch enemy Hugo Sogo has lots of tricks up his sleeves to become the one and only ruler of planet Gleesphere?

Feel the terror on the seas! Follow our four heroes as they search for the hidden treasure of all treasures, battle underwater monsters and reunite with some old friends.

The kids have learnt new skills; nine-year old Juniper Chase has become an expert diver and a master of disguise, his younger sister Dew is now a fantastic synchronised swimmer, their stepbrother River is teaching pirates how to play basketball and Ludwick is trying to learn how to swim, but will he succeed as pussycats just hate water?