A terrifying new Robobeast is about to be unleashed!
Max and Lia travel to the Sumaran settlement of Astar, which is under attack from a movingcity of inhabitants from the Primeval Sea.
The wicked pirate Cora Blackheart is on the loose again, and this time she's stolen the precious Arms of Addulis from Sumara.
A new Sea Quest is in store for Max and his friend Lia in this double helping of undersea adventure!