Overview: After four weeks of auditions, the show goes live and the final nine acts take to the stage for the challenge shows. Every week, each of the dancers is set a challenge that must be tackled with their dance captain to create an unforgettable performance. For the first time, the power is in the hands of the viewers; they vote to decide who stays in the competition. For the three dance captains - Cheryl, Matthew Morrison and Oti Mabuse - the pressure really is on, as they each mentor their three chosen acts through the live challenge shows