Board Thread:News and Announcements/@comment-5388250-20130511002143/@comment-5106672-20130511221444

Well, according to season one, the Mad Hatter arrives to Wonderland quite late, not much time before the Curse is cast. Since this is pre-Curse Wonderland, I think there will be enough time for him to finish the Captain America filming and join the set for some episode. :)