It's a mad, mad world!

Well, it's about to be one on Once Upon a Time, at least! ABC's hit series will take on Alice in Wonderland in an upcoming episode and have recruited a Captain America star to don a very special hat. Creators Edward Kitsis and Adam Horowitz sat down with reporters this morning (and supplied bagels! 10 seasons and a movie!) to discuss the show's upcoming (epic) roster of guest stars.

Plus, what's ahead for David (Josh Dallas) and Mary Margaret (Ginnifer Goodwin)? Here's what we can tell you...

Guest Stars Galore! Gossip Girl bad boy Sebastian Stan is set to guest star in the show's 17th episode, which takes place in Wonderland. Yeah, that Wonderland. Stan's role? Why, the Mad Hatter of course! "We find out how the Mad Hatter became mad," Kitsis teases. "Sebastian is so good in this role," he adds. "He's brilliant." So how will this Wonderland be different from what we already know? "The first [difference] you'll notice is in who the Mad Hatter was and his backstory. Then what Wonderland is and [its] changes is something we hope to explore also," Kitsis says. "We're hoping this tells you the story of the Mad Hatter, but will also leave you questions about Wonderland." 

Vampire Diaries and Alias star David Anders will also return later this season as the nefarious Dr. Whale, but his fairy-tale counterpart will not be revealed this season. His Alias costar (and Dollhouse and Angel actress) Amy Acker makes her OUAT debut in episode 14. "She is going to help tell the story of how Grumpy became Grumpy," Kitsis says of Acker's fairy character, Nova. 

Don't worry, we didn't forget about Belle (Emilie De Ravin), whose Storybrooke self is currently sittin' pretty in a secret padded cell. "She has a nice little scene in 14," Kitsis teases. "She's sitting up there with the person who loves her, not realizing it, and that would be someone I would not want to piss off," Kitsis says. Still, fans will have to wait a little longer for answers regarding Belle. "She's going to be back probably more toward the end of the season," Kitsis says. 

Finally, Barbara Hershey will guest star as Regina/the Evil Queen's (Lana Parrilla) mother. Of her character, Kitsis would only say, "Evil is not born, it's made. Her mother has a specific viewpoint about the world." Horowitz adds, "Hopefully you'll get a great insight into Regina and why she is the way she is."

True Love Is Tough: The disappearance of David's wife Kathryn (Anastasia Griffith) will throw a major wrench into his romance with Mary Margaret, with Kitsis saying, "This will definitely test them." Horowitz adds, "David and Mary Margaret are really fighting a curse to be together and this is just another element of that." Kathryn's disappearance will be a major plotline through the next four or five episodes that's going to take us "towards the mid-end season," Horowitz says. 

Fret not, David and Mary Margaret fans! While it may seem that the obstacles the adorable couple must overcome are endless, Horowitz says, "We are building to something this season with them that we're excited to share. There is a plan." Kitsis adds, "Their love is so strong that it keeps pulling them together no matter how hard we try and keep them apart."

True love's kiss has been known to break a curse or two on the show, so why didn't David and Mary Margaret's first kiss free them from Regina's spell? "I think that when David and Mary Margaret kiss, it wasn't an "Aha!' moment for them because the curse hasn't been broken yet and clearly they're not the keys to breaking it, they're just the keys to making the savior," Kitsis explains. 

Backstory Glory: We all know how much the Evil Queen hates Snow White, but we don't know why. Kitsis and Horowitz say viewers will finally learn what Snow White did to the Evil Queen in episode 18. Episode 19 will reveal more about Rumpelstiltskin (Robert Carlyle) and his relationship with his son. As for Henry's (Jared Gilmore) father, don't expect to find out his identity anytime soon, though the executive producers know who it is. Oh, and the Big Bad Wolf will be revealed in episode 15. No big deal, right?

What are you looking forward to seeing on Once Upon a Time? Do you think Stan will make a good Mad Hatter? Sound off in the comments!

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