Next week's episode of ABC's Once Upon A Time will see Emma & Regina embark on a very deadly mission to save Storybrooke, but it looks like they're going to run into some dragon-sized problems. Meanwhile, Snow White deals with her new predicament while Charming stays in limbo. Check out the new promo for the upcoming installment, titled "I'll Be Your Mirror," below:

Curses, it's what the Evil Queen does best. And next Sunday, she will create her most destructive spell yet.

Welcome to Storybrooke, a small town in Maine that you won't find on any map. This town is full of magic, populated by fairytale characters once cursed by the Evil Queen Regina to live in our world – deprived of their memories and happy endings. Until Emma Swan came to town and changed everything. With the help of her son, Henry, Emma embraced her true identity as the daughter of Snow White and Prince Charming – the Savior destined to break
Source: COMIC BOOK MOVIES