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) Making of Frozen", a three-minute musical production about how the film was made, "D'frosted", an inside look at how Disney tried to adapt the original fairy tale into an animated feature, four deleted scenes with introduction by the directors, the original theatrical short "Get a Horse!", the film's teaser trailer, and "Let It Go" (End Credit Version) music videos by Demi Lovato, Martina Stoessel, and Marsha Milan Londoh; while the DVD release includes the "Get a Horse!" theatrical short, "Let It Go" musical videos and the film's teaser trailer. On its first day of release on Blu-ray and DVD, "Frozen"