After a time of peace in Ninjago, the four ninja heroes must face unpredictable foes: four ancient snake tribes have been unleashed by Lloyd Garmadon, the son of their arch-enemy Lord Garmadon, and threaten to plunge Ninjago into ruin forever. According to an ancient legend, only one - the green ninja - can defeat the power of the snakes. But who will this hero be, and will he be able to save Ninjago from destruction all on his own?.