Board Thread:Spoilers!/@comment-1894786-20151104191856/@comment-4453062-20151107142109

I think they're only bringing back characters if they somehow fit in with the plot for 512. So far all of the announced returning guest stars have been dead characters, with the exception of Giancarlo Esposito as Sidney Glass/Magic Mirror. Since we now know that there seems to be an Evil Queen era flashback in the episode, that would explain why the Magic Mirror would appear. However, maybe 512 won't have just one narrative flashback, and instead could be a mixture of flashbacks like 311 was?