Once Upon a Time (2011)

S4E1 A Tale of Two Sisters

Elsa, feeling frightened and disoriented, arrives in Storybrooke and conjures a formidable snow monster to keep her safe. Meanwhile, Regina grapples with the uncertainty of her bond with Robin Hood, especially with Marian's return complicating matters. Elsa's sister is determined to retrace their parents' ill-fated journey, hoping to uncover whether it holds the key to managing Elsa's uncontrollable ice abilities.