Our Georgina is going to play "Frozen's" Ice Queen in "Once Upon a Time":

Haig will play "Frozen's" ice queen in season four of the ABC fantasy, joining previously announcedn Elizabeth
Lail's as Elsa's sister Hannah and “Greek” veteran Scott Michael Foster as her love interest, Kristoff.

The “Frozen” characters will reportedly join the “Once” storyline following the events of the hit Disney movie, after Elsa has frozen her kingdom with an eternal winter and discovered that love is the best way to control her powers.
http://variety.com/2014/tv/news/once...-4-1201257693/