Ninjago: Masters of Spinjitzu - Season 1 Episode 12

Upon arriving at Torchfire Mountain, where the Fangblades can be destroyed, Pythor reveals himself and steals the blades back, leaving the Ninja to die. The four, with Wu, Nya (Samurai X) and Lloyd, haste to the lost city of Ouroboros to try to stop Pythor from awaking The Great Devourer, but it is a race against time. After a battle on a Serpentine Truck-fortress, in which Sensei Wu deliberately cuts himself off from the Ninja, all arrive at the city. At last, Pythor succeeds, but Sensei Wu follows him and forces him to see the power he has unleashed. They are then both consumed by the awakened Great Devourer.