The interesting thing about Mulan is that she is not from another world she is an ancient chinese legendary figure probably based on a real historical person. If they are delving into legends and every imaginable fictional universe past or present they might feature King Arthur and Merlin in one episode. Hell I would love for Dr Who or at least the Tardis to make an appearance. I wonder how Rumpel would react if he ever came across the Daleks
"Exterminate" LOL anyway it does promise to be a real fun season.