One Wicked-related that I think Adam and Eddy did with the show was (if/when) Dorothy tried throwing a bucket of water at the Wicked Witch and it didn’t work. I mean, obviously it didn’t work because the Dorothy showed in the promo is from the past (right?) and Zelena’s still alive (at present). Unless, of course, they can find another water with some sort of even more powerful magic than the ones Dorothy used.
And didn’t A&E once said that it’s gonna take more than just a bucket of water to defeat Zelena?
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"There are bridges you cross you didn't know you cross until you've crossed." -- Glinda Upland, Wicked