VIDEO: Sneak Peek - 'Sisters' Episode of ONCE UPON A TIME

On the next episode of ONCE UPON A TIME on ABC titled "Sisters", fighting the wicked sister or battling an evil twin. Any sibling rivalry can turn into a war. The all-new episode airs next Sunday on ABC. Get a sneak peek below!

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 Wicked Witch/Zelena and Robert Carlyle as Rumplestiltskin/Mr. Gold.

Edward Kitsis and Adam Horowitz are creators and executive producers. Steve Pearlman, David H. Goodman and Andrew Chambliss are also executive producers. The series is produced by ABC Studios.

“Once Upon a Time” is broadcast in 720 Progressive (720P), ABC’s selected HDTV format, with 5.1 channel surround sound.