Elsa (Frozen) of the song "Let It Go", with critics frequently calling her a "powerhouse". Attempts were made as early as 1937 by Walt Disney to adapt Hans Christian Andersen's fairy tale, "The Snow Queen", into a film. The tale focuses on two children, one named Gerda, who served as the basis for Princess Anna, and the other named Kai, who is "cursed with negativity" after his heart is pierced with a shard of glass from an enchanted mirror and is later kidnapped by the Snow Queen. However, Disney struggled with creating a believable, multi-dimensional adaption of the fairy tale's title character,
Frozen (2013 film) held by "Finding Nemo") and among Walt Disney Animation Studios films (a record previously held by "The Lion King"). Box Office Mojo estimates that the film sold over 49 million tickets in North America. "Frozen" is the ninth-highest-grossing film, the highest-grossing animated film, and the highest-grossing 2013 film. It is the highest-grossing animated film in South Korea, Denmark, and Venezuela. It is also the highest-grossing Walt Disney Animation Studios film in more than 45 territories, including the Latin America region (specifically in Mexico and Brazil), the UK, Ireland, and Malta, Russia and the CIS, Ukraine, Norway, Malaysia, Singapore, Australia and