When the Savior becomes the "Dark Swan," the lines between good and evil blur as Emma begins to relish the intoxicating taste of absolute power. Terrified she'll succumb, Emma and Hook visit Camelot to find the one person who may be able to aid them: Merlin. Unfortunately, King Arthur proves treacherous, and when he joins forces with a vengeful Zelena, Emma and Hook's hopes are shattered.

Title from container. Widescreen (1.78:1) Bonus features: Merida in Storybrook; Tales from the underworld: a knight with Cruella; Once celebrates one hundred; The fairest bloopers of them all; Deleted scenes; Audio commentaries.

Disc 1.The Dark Swan ; -- The price ; -- Siege perilous ; -- The broken kingdom ; -- Dreamcatcher -- Disc 2. The bear and the bow ; -- Nimue ; -- Birth ; -- The bear king ; -- Broken heart -- Disc 3. Swan song ; -- Souls of the departed ; -- Labor of love ; -- Devil's due ; -- The brothers Jones -- Disc 4. Our decay ; -- Her handsome hero ; -- Ruby slippers ; -- Sisters -- Disc 5. Firebird ; -- Last rites ; -- Only you/An untold story.