Bobby (voiced by Anna Kendrick Anna Kendrick) is the princess of Elf City. She has magical powers and colorful hair. She is optimistic and likes singing. But one day, their little friend was captured by their sworn enemy, the Boet. In order to save her best friends from the Bognes. Bobby asks Bran (Justin Timberlake Justin Timberlake), the "weirdo" in Elf City, for help, but Bran is an unsociable pessimist. Although he agreed to the princess's request, he just wanted to let the princess know that the world was not just cakes and rainbows as she thought. Along the way, they experienced a lot of strange and interesting things together, and they also discovered things that they had never discovered before. But most importantly, with the help of Bobby, they found the ultimate secret weapon that could save the entire city of magic hair elves.