Identical twins Josh and Kyle make up the duo, who first appeared on The X Factor two years ago.
In Sunday night's show The Brooks were seen singing for the judges at the room auditions and reuniting with former mentor Louis Walsh, as their nan waited on outside.
"We auditioned for the show when we were 15 back in 2014 and got to Louis Walsh's judges' houses in Bermuda," the guys explained. "When we didn't get through we were gutted.
"We can totally understand where Louis was coming from [when he said we needed more time] and there's a huge improvement from those two 15-year-old boys, we're glad to be back... fingers crossed."
Returning with "unfinished business", The Brooks won four yeses from the judges to sail through to bootcamp.
Now chatting to the official X Factor website at ITV.com, The Brooks have revealed their big ambitions
"There’s nothing out there like us. We’re different because of the brother relationship, obviously," Josh said. "With the right mentor and the right the guidance, I think we can do really well and go further and further in the competition."
Kyle went on: “I think we’ve got a lot to prove. We came back to get to the Live Shows.. we want to win the competition.
“We’re excited to go to Boot Camp now and work really hard. Hopefully the Judges will see us improve in every step."
The Brooks are already one of the favourites but can they go all the way? Time will tell...
The X Factor 2016's final auditions air this Saturday at 8PM and the show continues with a bumper bootcamp episode on Sunday night from the earlier time of 7:30PM.