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Love. As seductive and dangerous as magic, this potent, unpredictable force proves to be the ultimate weapon in the epic battle between good and evil in ABC's Once Upon a Time: The Complete Fourth Season. Soon after Emma (Jennifer Morrison) and Hook (Colin O'Donoghue) unwittingly bring Elsa of Arendelle (Georgina Haig) to Storybrooke, they encounter the mysterious Snow Queen, whose relentless obsession with both Emma and Elsa has chilling consequences. Meanwhile, it appears Regina (Lana Parrilla) has at last found true love with Robin Hood (Tom Ellis). But how will she react when her happy ending is thwarted yet again by a maddening twist of fate?
Then, a banished Rumplestiltskin (Robert Carlyle) enlists the Queens of Darkness - Maleficent (Kristin Bauer van Straten), Ursula (Merrin Dungey), and Cruella De Vil (Victoria Smurfit) - in an insidious scheme to rewrite their own endings and corrupt the Savior by turning her newly blissful heart pitch-black.