VIDEO: Sneak Peek - 'Child of the Moon' Episode of ABC's ONCE UPON A TIME

On this Sunday's episode of the ABC drama ONCE UPON A TIME titled "Child of the Moon" - Ruby's fear about turning into a wolf during the first curse-free Storybrooke full moon is confirmed when one of the town's residents is viciously murdered, and Ruby is the prime suspect; Decker - aka King George - threatens to expose David as a shepherd, not a prince, and not fit to run the town as sheriff; and Leroy stumbles upon some treasure in the Storybrooke mine that could help bring Mary Margaret and Emma back into our world. Meanwhile, in the fairytale land that was, Red Riding Hood finds a kindred spirit in Anita (Annabeth Gish), a charismatic and mysterious leader of a pack of humans who, like Red, turn out to be wolves.

The episode airs SUNDAY, NOVEMBER 11 (8:00-9:00 p.m., ET) on the ABC Television Network. Get a sneak peek below!

"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, Keegan Connor Tracy as Mother Superior/Blue Fairy, Beverley Elliott as Granny, Alan Dale as Spencer/King George, Sarah Bolger as Aurora, David-Paul Grove as Doc, Faustino Di Bauda as Sleepy, Jeffrey Kaiser as Dopey, Michael Coleman as Happy, Mig Macario as Bashful, Jarod Joseph as Billy, Annabeth Gish as Anita, Ben Hollingsworth as Quinn, Jason Cermak as black knight no. 1 and Chad Riley as black knight no. 2.

"Child of the Moon" was written by Ian Goldberg & Andrew Chambliss and directed by Anthony Hemingway.