About Once Upon A Time Season 4, Episode 21 : Mother

Regina and Emma return Lily to her mother, but the reunion doesn't go as planned. Meanwhile, Gold gets worse and loses Isaac to a rival. In the past, Cora tries to unite Regina with her soul mate, but has her own ulterior motive. Guest Stars: Rebecca Mader, Sean Maguire, Kristin Bauer, Agnes Bruckner, John Innes, Jeremy Schuetze, Barbara Hershey, Wil Traval, Tony Perez, Patrick Fischler, Ingrid Torrance,