Once Upon a Time has found its Elsa.

Georgina Haig, best known for playing Etta Biship on Fringe, has landed the key role of this Frozen character on Once Upon a Time Season 4.

The actress (currently starring on CBS’ Reckless) will come on board this fall as the show’s version of a misunderstood villain who has long struggled to control her powers.

The only way she knows how is to maintain a bond with younger sister Anna, to be played by Elizabeth Lail.

When we meet Elsa on Once Upon a Time, she is keenly aware of the damage she can cause, having once unleashed an eternal winter with just a few touches of her “chilling” finger.

Earlier this week, ABC confirmed the casting of Lail as Anna and Scott Michael Foster as Kristoff, another character Frozen mainstay who will recur on Season 4.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.