The theme centers on the world of Ninjago, home to both modern cities and ancient villages. Ninjago was created by the First Master of Spinjitzu using the Four Golden Weapons: the Sword of Fire, the Nunchucks of Lightning, the Scythe of Quakes, and the Shurikens of Ice. The four weapons had so much power that no one could wield all four except for the master himself. He had two sons, Garmadon and Wu, who guarded the weapons and banished enemies into the Underworld, including the four-armed skeleton general Samukai. After the First Spinjitzu Master died, his son Garmadon was corrupted by the venom of the Great Devourer and wanted to use the Golden Weapons to recreate Ninjago in his own evil image. However, younger brother Wu fought Garmadon, and Garmadon was banished to the Underworld, vowing to return one day. Wu then hid the weapons in different parts of Ninjago and gave the map to his friend, Kai's father (Former Elemental Master of Fire), to hide. However, peace didn't last for long, as Lord Garmadon defeated Samukai, the former general, and took control over the Skulkin Army. Wu brings together four young ninja, Kai, Master of Fire, Jay, Master of Lightning, Cole, Master of Earth, and Zane, Master of Ice to combat the evil Lord Garmadon and his skeleton army and prevent the Four Golden Weapons from falling into evil hands.