“Lost” fans rejoice – yet another former cast member is joining ABC’s “Once Upon a Time.” Fresh on the heels of the casting of “Frozen” characters Elsa, Anna and KristoffEntertainment Weekly is reporting that Elizabeth Mitchell has joined Season 4 of the hit show.

Mitchell, who is best known for her roles as Juliet on “Lost” and Rachel on “Revolution,” will be part of the “Frozen” story arc on “Once Upon a Time.” Details regarding her character have yet to be revealed. According to EW, the mysterious new role could be villainous and is expected to take place after the events that occurred in the 2013 Disney animated film.

The addition of Elizabeth Mitchell isn’t much of a surprise. Series creators Adam Horowitz and Edward Kitsis served as writers and co-executive producers for “Lost.” Other “Lost” alums that have made their way onto the hit ABC fairytale drama include Emilie de Ravin (Belle on “OUAT”/ Claire on “Lost), Jorge Garcia (Anton the Giant on “OUAT”/ Hurley on “Lost”) and Alan Dale (King George on “OUAT”/  Charles Widmore on “Lost”). Naveen Andrews, who played Sayid Jarrah on “Lost,” starred in the “OUAT” spinoff, “Once Upon a Time In Wonderland,” as Jafar.

Elizabeth Mitchell will be joining fellow “Once Upon a Time” newcomers Georgina Haig (Elsa), Elizabeth Lail (Anna) and Scott Michael Foster (Kristoff). It’s unconfirmed if Mitchell will be making her appearance in the Season 4 premiere, which is rumored to focus on the introduction of the “Frozen” characters.

What do you think of the Season 4 casting news for “Once Upon a Time”? Tweet your thoughts to @AmandaTVScoop.