ABC's Once Upon a Time surprised many viewers during its season finale when it teased the appearance of Frozen star Queen Elsa in the town of Storybrooke. While that moment might have been achieved with the help of a stand-in, the show's creators have been working to find out exactly who can fit into character's big shoes (or boots).

TVLine reports that, while Elsa's casting hasn't been nailed down, producers have found their versions of Princess Anna and her ice-selling boyfriend Kristoff.

A relatively new actress named Elizabeth Lail will play Anna. Her only existing credits to date include a pair of shorts called Model Airplane and Without. Meanwhile, Greek and Zero Hour alum Scott Michael Foster has joined on as Kristoff.

From the sound of the character descriptions posted on TVLine, the series will pick up after the events of the film, but official details haven't been released:

Once‘s Anna is described as a fun-loving, fearless optimist who often gets herself into situations where she is in over her head, yet is able to triumph due to her resourcefulness and can-do spirit. She values her relationship with her sister Elsa above all else.

Kristoff meanwhile is a hearty, salt-of-the-earth ice cutter whose sometimes-gruff demeanor can hide his deep love for Anna and her sister Elsa. When we first meet him on Once, he is adjusting to life at the castle — including sleeping indoors for the first time in his life.

The fourth season of ABC's Once Upon a Time premiere this fall on ABC.