Broadway actress Idina Menzel, best known for performing Elphaba from Wicked, was cast to voice Elsa. Director Chris Buck believed that Menzel's vocals would help in the portrayal of the character, saying, "Idina has a sense of vulnerability in her voice. She plays a very strong character, but someone who lives in fear—so we needed someone who could portray both sides of the character, and Idina was just amazing." In an interview with Menzel, she acknowledged the similarities between Elsa and Elphaba. She mentioned they were both very powerful and misunderstood individuals, and she herself could relate to the characters, having hidden her singing talent from her peers at school. "I didn't want to alienate anyone," she explained. "If everyone was singing along in the car to a Madonna song, I didn't join in because when we're younger we're afraid of sticking out or showing off, when in fact we should own those things that make us really unique.