Nighlok are fictional villains from the Power Rangers franchise, specifically featured in the series Power Rangers Samurai. They are dark, monstrous creatures that serve as the primary antagonists, often seeking to conquer the world and defeat the Power Rangers. Each Nighlok has unique abilities and characteristics, making them formidable foes. The Nighlok are led by Master Xandred, a powerful entity who commands them to carry out his evil plans. They often use dark magic and various minions to challenge the Samurai Rangers, who must work together to protect humanity and restore peace.