Board Thread:Spoilers!/@comment-6175354-20141215234519/@comment-24674051-20150311172528

Also, if someone does come back for an existing role (whether Green Screen or on Set), there is usually no big announcement (unless from the actor themselves), unlike when a new role is filled where we usually get the casting announcment once the role is filled. Hence the surprise when we found out that Bex Mader was back on set, or the ability to introduce Marian in the Season 3 Finale without a lot of fanfair. The casting agents have done a very good job of casting the roles as they come, and the everyone has done a good job making sure that the roles, once cast, are filled only by the original actor (Robin Hood being the one glaring exception).