Emma Willis hosts the third and final episode of the Battle rounds. Coaches Will.i.am, Sir Tom Jones, Olly Murs and Meghan Trainor all return to their infamous red chairs as the acts they have chosen from the blind auditions go head to head and fight for their place on their coach's team. The singers that impress their coach the most remain in the competition, but those that aren't so lucky can still be stolen by another coach.