"Darkness on the Edge of Town" is the thirteenth episode and spring premiere of the fourth season of the American fantasy drama series Once Upon a Time, which aired on March 1, 2015. In this episode, Hook and Belle attempt to find a solution to liberate the fairies from the Sorcerer's hat. Emma, Henry, and Regina continue their investigation to track down the author of the storybooks, while a strange darkness called Chernabog threatens Storybrooke. In New York, Mr. Gold acquires a new ally named Cruella De Vil with the help of Ursula. Flashbacks show how Ursula, Maleficent, and Cruella met.