4x05 Emma Hook, 2

REGINA RELUCTANTLY TEAMS UP WITH EMMA TO SEARCH FOR THE SNOW QUEEN, ELSA SEES ANNA IN THE STORYBROOKE WOODS, AND IN THE PAST, YOUNG EMMA BEFRIENDS A KINDRID SPIRIT, WHO, LIKE HER, IS A RUNAWAY ORPHAN, ON ABC S ONCE UPON A TIME Elizabeth Mitchell ( Lost ) Guest Stars as the Snow Queen Giancarlo Esposito ( Breaking Bad ) Guest Stars as Sidney Breaking Glass Regina reluctantly teams up with Emma to search for the Snow Queen after Sidney, who is once again Regina s prisoner in the mirror, discovers her