The Oni are coming … As demonic darkness descends upon the realm of Ninjago, the time has come for our heroes to rise again and protect the land that all Masters of Spinjitzu call home. It is a world filled with a rich history and legacy, and it is from here where our ninja heroes must unlock an even greater power to defeat the darkness that is marching towards them. What could these shapeshifting dark forces be, why do they want to destroy Ninjago, and how can they be defeated?

吴大师训练了4位擅长幻影旋转术的幻影忍者，他们正在寻找4件威力无比的黄金武器，以维护世界和平。魔王加满都和他的骷髅军团紧随其后，企图夺走武器并统治世界。勇敢的幻影忍者们踏上征途，一路战斗，但最终魔王加满都利用4件黄金武器离开了幻影忍者王国。

Season one (10 episodes) of the show features on aging master Sensei Wu as he struggles to train four young Ninja in the ways of an ancient battle art called Spinjitzu to defeat his evil brother Lord Garmadon, ruler[but not king] of the underworld, and stop him from gaining four golden weapons which would make his power limitless. Though many skeleton characters are introduced, only Kruncha and Nuckal appear in season two, making cameos as substitute teachers. Season two (13 episodes) focuses on Garmadon's young son Lloyd Garmadon, who, lacking proper fathering, has released an ancient evil army of snakes, who hold unique powers. The four Ninja must stop them from uniting to unleash the Great Devourer, an evil with power to consume the land.

While Lloyd and Nya resist Emperor Garmadon's oppressive hold on Ninjago City, Young Wu and the rest of the Ninja are stranded in a barbaric realm where fierce dragons are being hunted down by Iron Baron and his gang of Dragon Hunters. Lloyd must endure in NINJAGO City, the others need to find the fabled Dragon Armor if they ever hope to get back home to stop Emperor Garmadon once and for all.

In season seven, Kai and Nya finally learn the truth about their long lost parents, Master-in-Training Lloyd tries to fill in for a weakened Wu and an all-new Samurai X returns.

After a time of peace, the Ninja are called back into action. The spirit of the defeated Overlord has infected the electric grid of Ninjago and is using all available technology to exact his revenge on Lloyd. Nowhere is safe but fortunately, the Ninja have been given the powerful Techno Blades. But the only problem is that they have no idea how to use them.