Regina Makes Zelena A Chilling Promise In Once Upon a Time Clip From "Siege Perilous"

ABC has released a third clip from this Sunday's episode of Once Upon A Time: "Siege Perilous."

Regina (Lana Parrilla) has an intense chat with her Zelena (Rebecca Mader), the Wicked Witch, about Zelena trying to escape back to Oz with her and Robin Hood's child. When Zelena tries to plead her case, claiming to be a victim once again, a fiery Regina promises that her half-sister's baby will be well taken care but that same can't be said for Zelena.

Check out the sneak peek in the video below.

In Camelot, the heroes feverishly work to free Merlin. Determined to help Emma, David embarks on a quest to retrieve a magical relic that Regina could use to communicate with the imprisoned sorcerer, but, when David leaves, ARTHUR insists on joining him because the dangers ahead are greater than he can imagine. Meanwhile, Mary Margaret discovers the fate of her old friend Lancelot. Back in Storybrooke, ARTHUR seeks David's help to catch a thief who threatens the safety of the citizens of Camelot. Across town, Emma reaches out to a conflicted Hook as she sets about her plan to draw Excalibur from the stone.

"Siege Perilous" episode of Once Upon A Time airs Sunday, October 11th at 8/7c on ABC.