It's a Lost reunion of sorts, as Elizabeth Mitchell (Lost, V, Revolution) is joining Season 4 of ABC's Once Upon a Time , which was created by Lost writers Adam Horowitz and Edward Kitsis.

Elizabeth Mitchell.

And according to EW , Mitchell will be a part of the recent Frozen frenzy sweeping OUAT (and the world) - playing a mysterious role that will be connected to the much-anticipated Frozen-inspired storyline happening next season.As reported already, Fringe's Georgina Haig has been cast as Elsa and Elizabeth Lail and Scott Michael Foster are set to play Anna and Kristoff. EW has heard that Mitchell's role might be a villainous one - a “possibly malevolent” character with ties to Elsa and Anna, along with Storybrooke and Arendell.

Matt Fowler is a writer for IGN. Follow him on Twitter at @TheMattFowler and Facebook at Facebook.com/Showrenity