Elsa and Anna and from the Disney hit movie Frozen join the story in Once Upon a Time season 4 as they search for answers in their parents' death and what drives Elsa's magical powers.

But when Anna goes missing as she hunts for answers, Elsa ends up in Storybrooke to find her. When fear over takes her, she unwittingly conjures a snow monster to help her get away.

Elsewhere Regina is heartbroken when Robin Hood's wife Marian is brought back from the grave by Emma's time jump. Regina hopes to find a way to get rid of Marian by bringing back her magic mirror. Instead she comes up with a new plan geared at finding her her own happy ending.

Rumpelstiltskin is moved by Neal's death and decides to try and make things right with Belle as the two share a romantic night in an abandoned mansion that just appeared in Storybrooke.

Elsewhere, Emma seems to be holding Hook at arms length and she uses the latest crisis as an excuse. Hook points out that theirs always a crisis and that they need to live their lives in spite of them. Don't miss a minute of the magic. Watch Once Upon a Time Season 4 Episode 1 here at TV Fanatic.