Board Thread:General Discussion/@comment-24768469-20140403021912/@comment-1674355-20140406060118

Mabel's secret double, or mirror doppelgander (often called Lebam because of the bottle-notes that may have been addressed to her in "The Deep End") is a pretty strong theory at this point. I expect to see her in some form or other in the second season. It is still a theory, not a spoiler.