Board Thread:General Discussion/@comment-25850402-20160613152858/@comment-24674051-20160614171350

I think the Oz Spin-off has the best chance. There is enough setup from the main show to establish Oz as a land. There is, as was pointed out, plenty of material to use. Plus you could pull in additional material from other sources, just like they do with Once, and did with Wonderland. And there would be opportunity to incorporate guest appearance from the Main cast of Once, should the story warrant.

And while we would not HAVE to see Zelena, it is also not out of the realm of possibility to have Zelena appear. Though if Zelena continues down the path of reformation, would she come back as the GOOD witch of the west? (Another topic for another thread.)