Zelena (Once Upon a Time)
In December 2013, Rebecca Mader was cast as the Wicked Witch of the West. She made multiple appearances during the second half of season three and was promoted to a series regular for the show's fifth season. The role of the Wicked Witch of the West was written specifically for Rebecca Mader. It was announced that the writers had chosen not to continue with Zelena's storyline and Mader would not be returning for the seventh season of the show. However, Mader later revealed that she would be returning for multiple season seven episodes.
Once Upon a Time (season 3)
After "Once Upon a Time in Wonderland" was canceled, it was reported that Michael Socha, who plays the Knave of Hearts, was in talks to join the main cast in Season 4. On April 2014, it was confirmed that Michael Socha will become a regular for Once Upon a Time's fourth season.