VIDEO: Sneak Peek - ONCE UPON A TIME's 'Queen of Hearts' Episode

On the upcoming episode of the ABC drama series ONCE UPON A TIME titled "Queen of Hearts", Cora and Hook face off with Mary Margaret and Emma in a race to secure the compass, which will point its holder to the portal into Storybrooke. But back on the other side, Regina and Mr. Gold, desperate to keep Cora out, put a plan into action that would kill anyone entering the portal - placing Mary Margaret's and Emma's lives in danger as well. Meanwhile, back in the fairytale land that was, Captain Hook travels to Wonderland and meets up with a vengeful Queen of Hearts. The episode airs SUNDAY, DECEMBER 2 (8:00-9:00 p.m., ET) on the ABC Television Network.

"Once Upon a Time" stars Ginnifer Goodwin as Snow White/Mary Margaret, Jennifer Morrison as Emma Swan, Lana Parrilla as Evil Queen/Regina, Josh Dallas as Prince Charming/David, Emilie de Ravin as Belle, Jared S. Gilmore as Henry Mills, Meghan Ory as Red Riding Hood/Ruby, and Robert Carlyle as Rumplestiltskin/Mr. Gold.

Guest starring are Lee Arenberg as Leroy/Grumpy, Barbara Hershey as Cora, Colin O'Donoghue as Hook, Sarah Bolger as Aurora, JAMIE CHUNG as Mulan, David-Paul Grove as Doc, Faustino Di Bauda as Sleepy, Jeffrey Kaiser as Dopey, Michael Coleman as Happy, Mig Macario as Bashful, Paul McGillion as Knave of Hearts and Paul Lazenby as Black Knight No. 1.

"Queen of Hearts" was written by Edward Kitsis & ADAM HOROWITZ and directed by Ralph Hemecker.