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.
Zelena (Once Upon a Time)
Instead, Zelena travels the time portal with Emma and Hook to change the past, where she takes the opportunity to kill Robin's wife, Marian, and takes her place instead using magic to conceal her true identity. At some point after turning into Marian, Zelena uses magic to learn everything she can about her.