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 4)
On September 4, it was revealed that Frances O’Connor was cast as Belle's mother, Colette for the sixth episode, although appearances later on in the season were also hinted. A new character, Lily, has been cast to Nicole Muñoz, while Sally Pressman was given the role of Helga. It was announced on November 5, 2014 that Victoria Smurfit would be portraying Cruella de Vil in a recurring capacity later on in the season and that hints will be placed in the next few episodes. Another Disney villain was also cast in the form of Ursula from The Little Mermaid who was portrayed by Merrin Dungey, the character portrayed is named after the original sea-goddess who was portrayed by Yvette Nicole Brown in the season 3 episode, "Ariel". Straten, Smurfit, and Dungey all first appeared in the winter finale, "Heroes and Villains", and are collectively called the "Queens of Darkness".