The clever crossover — Disney, which released the animated blockbuster "Frozen," also owns ABC — was first teased in the Season 3 finale of of the fairy-tale drama, which quickly cast the roles of Queen Elsa, Princess Anna and Kristoff for the storyline. Producers are still looking for someone to play Prince Hans.
"Once Upon a Time" returns Sept. 28 on ABC. The first two episodes of the fourth season are titled “A Tale of Two Sisters” and “White Out.”
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