Which 'Wizard of Oz' Characters Will Arrive on 'Once Upon a Time'? We've Got Some Wicked Clues

The worlds are clashing on Once Upon a Time, and that means one thing: more fairytale characters, including familiar faces from The Wizard of Oz . This season, our favorite storybook characters like Snow White and the Evil Queen — also known as Mary-Margaret and Regina — have once again fallen under a curse inflicted on them by the Wicked Witch of the West, Zelena. This curse has wiped away an entire year in the Enchanted Forest from the minds of the Storybrook folk, leaving them with a whole bunch of questions about how exactly they spent their past year. Now that the Wicked Witch of the West is stirring up trouble in Storybrooke, it's only a matter of time before more of our favorite Wizard of Oz characters pop into this small town.

So, what other Wizard of Oz characters can we expect to see this season? Well, with everything bad, comes something good... and in this case, that good is in the form of Glinda, the Good Witch. Sunny Mabrey will join the cast as Glinda the Good in an episode slated to air in the later half of this season. While no other details have been provided yet, executive producers Edward Kitsis and Adam Horowitz have hinted that we will see some more "iconic friends" venture to Storybrooke.

But don't expect to see any ruby slippers just yet — so far, there's no word on whether Dorothy will be making an appearance. That's too bad, because it looks like the folks in Storybrooke are having a really tough time dealing with their witch problem. In fact, in the new sneak preview for Once Upon a Time, the Storybrooke mayor, Regina, is already warning townspeople to keep extra buckets of water on hand, lest they spot the witch.

Check out the new preview below, and tune into Once Upon a Time on Sunday at 8PM on ABC.

Photo: ABC