ABC and Elizabeth Mitchell just can’t quit each other, and the actress who once appeared on Lost and V for the network will be playing a recurring role on Season 4 of Once Upon a Time.

This upcoming iteration is of particular interest, as the good citizens of Storybrooke will be reliving the hit movie Frozen, with sisters Elsa (Georgina Haig) and Anna (Elizabeth Lail) joining the show. As for Mitchell’s role, she may be reversing course from her usual route and playing someone bad, with a source telling EW that she will be “possibly malevolent.”

It will still be a while until the show hits the airwaves in the second half of 2015, which leaves plenty of time for speculation between now and then.

[via EW]