'Once Upon a Time': 'Hat Trick' in pictures

After last week's riveting episode, the next Once Upon a Time instalment titled 'Hat Trick' looks pretty intriguing as we will be told the Mad Hatter's backstory.

In the fairytale world, the Evil Queen (Lana Parrilla) has authorised a mission to steal a "prized artefact" from the Queen of Hearts in Wonderland, while in present-day Storybrooke, Emma (Jennifer Morrison) is kidnapped by a hat-obsessed man (Sebastian Stan) as she is looking for the missing Mary.

Check out photos of the next Once Upon a Time episode below.

Once Upon a Time airs on Sunday at 8/7c on ABC.