Board Thread:Spoilers!/@comment-27060727-20161201052050/@comment-24674051-20161201142335

The title alone almost screams a Robin & Regina centric. And I think Lady J has the right idea. This episode will tie up a lot of loose ends regarding Regina, her feelings toward Robin and Zelena, and maybe also sets in motion the storyline to complete the Serum Queen plot, meaning this is where Regina finally decides that she needs to take back her alter ego and enlists help from Emma and Zelena (and maybe even Rumple, depending on where he is on his mood cycle) to find a way to undo the split.

And I pick Emma and Zelena for a couple of reasons. 1 is that they are both more than capable sorceress's, and they both will have 'skin in the game' as far as helping Regina in her quest.