** Note: This episode contains "Frozen 2" spoilers.

"Frozen" became the top-grossing animated feature of all time after its 2013 release, so creating a sequel to the beloved film about two royal sisters' unbreakable bond wasn't something "Frozen 2" writer/director Jennifer Lee took on lightly. Lee talks with ABC News' Ginger Zee about the challenges of crafting a new adventure for Anna, Elsa, Olaf, Kristoff and Sven, and being a creative leader at Walt Disney Animation Studios.

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