THE HEROES' CAMELOT QUEST CULMINATES WITH AN IMPOSSIBLE DECISION EMMA MUST MAKE WITH CONSEQUENCES SHE MAY NEVER BE ABLE TO COME BACK FROM, AND IN DUNBROCH, MERIDA TEAMS UP WITH MULAN AND RUBY ON A VERY PERSONAL MISSION, IN A SPECIAL TWO-HOUR "ONCE UPON A TIME," STARTING AT 8/7c, SUNDAY, NOVEMBER 15 ON ABC

Guest Star Jamie Chung Reprises Her Role as Mulan and Meghan Ory Returns as Ruby

In the first hour of this special "Once Upon a Time" event - "Birth" - tensions in Camelot come to a head when Merlin, now under Arthur's control, delivers an ultimatum to Emma: hand over the Dark One dagger and the Promethean spark or he will kill her entire family. Refusing to give in, Emma and our heroes face off against Arthur, Merlin and Zelena in an epic battle of magic and will. Just when the end is in sight, Emma is forced to make a gut-wrenching choice that no one saw coming. Back in Storybrooke, Zelena's pregnancy mysteriously accelerates and Hook goes to new and desperate lengths to get answers from the Dark Swan. 

"Once Upon a Time" stars Ginnifer Goodwin as Snow White/Mary Margaret, Jennifer Morrison as Emma Swan, Lana Parrilla as the Evil Queen/Regina, Josh Dallas as Prince Charming/David, Emilie de Ravin as Belle, Colin O'Donoghue as Hook, Jared S. Gilmore as Henry Mills, Sean Maguire as Robin Hood, Rebecca Mader as the Wicked Witch/Zelena and Robert Carlyle as Rumplestiltskin/Mr. Gold.

Guest cast includes Beverley Elliott as Granny, David-Paul Grove as Doc, Micahel Coleman as Happy, David Anders as Dr. Whale, Ingrid Torrance as Nurse Ratched, Elliot Knight as Merlin, Liam Garrigan as King Arthur and Joana Metrass as Guinivere.