Disney's "Frozen Fever" is a new short film based on the animated feature "Frozen," which spawned the hit song "Let It Go" and became a worldwide phenomenon. Idina Menzel, Josh Gad, Jonathan Groff and Kristen Bell return to voice the characters of Elsa, Olaf, Kristoff and Anna, respectively. The film features a new song by Robert Lopez and Kristen Anderson-Lopez. Opening March 13, it will play exclusively in theaters alongside Disney’s new live-action "Cinderella" starring Lily James and Cate Blanchett.