When Louis revealed he had made it through, Brendan was clearly overjoyed and broke down in tears as he phoned his mum with the good news.
Brendan will join Armstrong Martins, Dalton Andre Harris, and Anthony Russell in Louis' final four for the live shows.
The former Hometown star previously earned the Golden X at the Six Chair Challenge with his performance of REM's Everybody Hurts, prompting Simon Cowell to comment, "You are in a completely different league to everyone else we've seen so far."
Meanwhile, Ayda Field employed the help of former X Factor winner Leona Lewis and Adam Lambert to help her choose her final four in her Overs category.
Both Olatunji and Janice Robinson both sang original songs while Ricky John sang Percy Sledge's When A Man Loves A Woman, Louise Setara tackled Kelly Clarkson's Piece by Piece. Danny Tetley chose Eva Cassidy's Somewhere Over the Rainbow.