Spoiler Chat: Once Upon a Time's New Villain

Monica: So excited for Rebecca Mader on Once Upon a Time! Can you spill anything on what she's playing?She's one of the best female villians of all time, and not just in recent Disney history. This one even has her own theme music! Also, we can tell you that she is being brought in because now that Rumple and Regina have made peace, the writers felt they needed a new Big Bad and Mader's character will definitely be at odds with Regina. We will hopefully have your very first look at Mader's character (the new villain) on the night of Dec. 15 on E! Online, right after the episode of Once Upon a Time ends, so make sure you check back!