Board Thread:Spoilers!/@comment-27060727-20151022205759/@comment-24674051-20151022211315

Definitely sounds like a take on Hades. Although, maybe it has nothing to do with anyone dying. That's been everyone's guess so far.

What if, as part of undoing the Darkness in Emma, they have to 'Prison Break' someone from the Underworld. No one dies initially. Of course, breaking someone out of the underworld can never be good. All sorts of Hell is going to break out in Storybrooke, and it's possible it might not even be contained there.