In their new show K3 are introducing their new member and friend Josje Huisman who is replacing the first singer Kathleen Aerts. To say welcome to her, Karen and Kristel each are giving her a present. However Kristels present is replaced by a girl named Kassandra who wishes to perform with K3 forever. The girls are against it. However Karen says that if she has such a nice voice as Josje, she can perform. What K3 don’t know that Kassandra is actually a witch who has created magical water that makes it possible to get any voice she wants. After she is asking Josje to drink it, she is able to talk and to sing with Josje’s voice and Josje is forced to use Kassandras voice. Will it stay forever or is it possible for the girls to undo the magic spell?