For centuries, heroic Samurai Power Rangers waged a war against an army of darkness led by Master Xandred, the leader of the Nighloks. Once conquered, the Rangers sealed Xandred and his evil clan deep away in a shadowy Netherworld. The Rangers knew the seal might someday be broken, so for generations they have been training their children in the ancient powers of the Samurai. With the guidance of their Samurai mentor, these young Rangers must master Samurai skills and develop their unique powers over the elements of fire, water, sky, forest, and earth. By practicing the mysterious Samurai Symbols of Power and activating the Ancient Samurai Discs they unlock even greater powers and abilities. But they face a formidable foe. The Evil Master Xandred has discovered that by scaring humanity, the Netherworld's River will continue to rise until it floods the earth. He releases terrible Nighlok monsters, including the indomitable warrior Deker, through a cosmic rift between our two worlds to help him unleash this new era of fear. Only the brave Samurai Rangers led by the iconic Red Ranger stand between us and total destruction. But the Rangers will soon be joined by an unexpected hero...a golden ray of hope who will help them in their quest to rid our world of evil and bring peace once again.