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"After last week&amp;#039;s riveting episode, the next Once Upon a Time instalment titled &amp;#039;Hat Trick&amp;#039; looks pretty intriguing as we will be told the Mad Hatter&amp;#039;s backstory. In the fairytale world, the Evil Queen (Lana Parrilla) has authorised a mission to steal a &amp;quot;prized artefact&amp;quot; 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. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/tv/once-upon-a-time/news/a372548/once-upon-a-time-hat-trick-in-pictures/>