Dermot O'Leary presents the singing challenge as Simon Cowell heads up the judging panel, alongside seasoned judges and music industry veterans Sharon Osbourne, Louis Walsh and Nicole Scherzinger. In the first of three special Six Chair Challenge episodes, the stakes are high as acts from each category perform individually. Their judge then has to decide if they want the act to take one of the six seats on stage - each one representing a place at Judges' Houses. However, even if they win a seat, the contestants face an anxious wait as no one is safe until the last person in each category has sung. Each judge is able to change their mind at any point, swapping an act already through with someone else who comes on and out-performs them. Who will have what it takes to keep hold of their seat and move one step closer to a coveted place in the live shows?