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.
It's Not Easy Being Green (Once Upon a Time)
Hillary Busis of "Entertainment Weekly" gave it a good review: "'Once's' version of the Man Behind the Curtain emerged for the first time tonight. When he did, we learned that the guy in question is none other than... Benjamin Linus. Just kidding! It's Walsh, a.k.a. Christopher Gorham, a.k.a. the dude who would become Emma's flying monkey beau. This week's episode gave his truncated origin story -- but more than that, it delved into Zelena's past to shed a glowing green light on how she became such a cold-hearted witch in the first place. (Given how literal "Once" can be, I wouldn't be surprised to learn Zelena's ticker is literally encased in a layer of ice.)