With the defeat of Morro’s ghost invasion, the ninja have now become huge media celebrities. But dark forces once more threaten NINJAGO Island as the Teapot of Tyrahn is rediscovered by the ghost of Clouse, Master Chen’s former right-hand man. He allows Nadakhan, an evil Djinn and captain of the infamous Misfortune’s Keep, to escape the teapot. After reassembling his pirate crew, Nadakhan returns to his home realm of Djinjago, to find it collapsing. This destruction, caused by the ninja defeating the Preeminent, leads Nadakhan to vow revenge. He refits his ship so it can fly and prepares to attack. Now they are Sky Pirates.
Since Lord Garmadon’s disappearance from the Underworld, NINJAGO Island has been at peace, but the young ninja have grown lazy. While Garmadon lurks in the shadows, waiting for the right moment to strike, the ninja meet his young son, Lloyd, who carelessly unleashes a fearsome new enemy upon NINJAGO Island – the ancient tribes of the Serpentine. The leader of the Serpentine, Pythor, hatches an evil plan to bring back the legendary, all-consuming snake, the Great Devourer.
Long before time had a name, the NINJAGO world was created by the First Spinjitzu Master by using the Four Golden Weapons of Spinjitzu; weapons so powerful, no one could handle all of their power at once. When he passed away, his two sons swore to protect them, but the oldest, Lord Garmadon, was consumed by darkness and wanted to possess them all. A battle between brothers broke out. Lord Garmadon was defeated and banished to the Underworld.