Once Upon a Time is already bringing in Ariel, Mulan, Aurora, Hook, and many more characters from classic Disney fairytales. But what about The Wizard of Oz?

TV Guide reports that the producers have actually been hinting at Oz since the beginning when Henry’s book showed flying monkeys, and now Kitsis and Horowitz further tease that we’ll see the world in the future:

There are many different doors and I might’ve seen a green curtain. As we said in the episode with Wonderland, the Mad Hatter talks about all these worlds. We’re very excited about the possibilities for where we could show.

Could you see Dorothy, the White Wizard, or – dare we say it? – Elphaba in a future episode of Once Upon a Time?