A sea monster has attacked the Octonauts, and it turned out to be Irving, the giant squid cousin of Professor Inkling. Now the Octonauts will have to look for him to discover what happened and help him. Go along with Professor Inkling, Captain Barnacles and Kwazii in search of the Giant Squid in an exciting adventure where you will have to drive the Gup-A around the underwater world of the Octonauts. To find the Giant Squid you will have to sail to the caves of the depths, overcoming all the challenges that you will find in your way. To successfully end your mission, you will have to complete 15 funny games and help the Giant Squid.