ABC has announced that Elizabeth Mitchell (TV's 'Lost') will be joining 'Once Upon a Time' next season as a yet-to-be-announced character that will be a part of the 'Frozen' story arc.

Entertainment Weekly writes that Mitchell's character will be a new one that was not featured in the animated film, but will reportedly have villainous ties to Elsa and Anna.

Season 3 of 'Once Upon a Time' concluded with a tease that the characters of 'Frozen' would be featured in the upcoming season. The network has already announced that Georgina Haig and Elizabeth Lail have been cast in the roles of Elsa and Anna, respectively. Scott Michael Foster has also been selected to play the character of Kristoff.

'Once Upon a Time' Season 4 will take place after the events in 'Frozen' but how they will interact with the residents of Storybrooke, Maine have yet to be revealed.

We shall find out when the new season premieres on ABC this fall.

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