STAGE TUBE: Sneak Peek - Regina Faces A Decision on ONCE UPON A TIME

On Sunday night's episode of the ABC drama series ONCE UPON A TIME entitled "The Stable Boy", Emma continues her exhaustive search for evidence that will prove Mary Margaret's innocence in the murder of David's wife, Kathryn. Meanwhile, in the fairytale land that was and before evil blackened her soul, Regina must choose between betraying her mother, Cora (Barbara Hershey), and marrying for true love, or betrothing royalty and living a regal - but loveless - life; and the event that caused the Evil Queen to loathe Snow White is revealed. The episode airs SUNDAY, APRIL 1 (8:00-9:01 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, Robert Carlyle as Rumplestiltskin/Mr. Gold, Lana Parrilla as Evil Queen/Regina, Josh Dallas as Prince Charming/David, Eion Bailey as August, JarEd Gilmore as Henry Mills and Raphael Sbarge as Jiminy Cricket/Archie Hopper.

Guest starring are Anastasia Griffith as Kathryn/Abigail, Meghan Ory as Ruby/Red, Tony Perez as valet/father, Giancarlo Esposito as Sidney/The Mirror, Alan Dale as Albert Spencer/King George, Barbara Hershey as Cora, Noah Bean as Daniel/stable boy, Richard Schiff as King Leopold and Bailee Madison as young Snow White.

For more information on "Once Upon a Time," visit ABC.com/Once

To get a sneak peek at the upcoming episode, click below!