Sharon Osbourne returns to the panel alongside Gary Barlow, Louis Walsh and Nicole Scherzinger, and Dermot O'Leary resumes hosting duties.
It's the 10th series and producers are pulling out all the stops. First up, the hopefuls must tackle two sets of auditions – they face the four judges in the intimate audition room, and if they're successful, they'll head off to Wembley Arena to audition in front of a 4,000 strong audience.
Who will win a coveted Boot Camp place? Who will win the judges' hearts? And more importantly, who will win over the nation? We can't wait to find out!
The X Factor, ITV, 8pm
Watch a preview of tonight's episode here:
All the X Factor winners in pictures:
Copyright: WENN Harsha Gopal