Brett comes from a family of dreamers and has come to America's Got Talent to pursue his dream of having his own show in Las Vegas. Brett has been pursuing his dream since leaving his hometown to become a street performer swallowing swords. Brett's journey on AGT has been… well, interesting. During his first performance, everything went wrong. With Sofia as his assistant, she refused to pull a sword out of his throat. Finally, after multiple attempts and convincing from both Brett and the judges, Sofia was brave enough to complete his first trick. Before Brett could continue his planned routine, Simon took over and asked to pull out a sword. So Brett compromised and did something he's never done before. He swallowed three swords and let each judge pull one out. Now that Brett has returned for the live shows, anything can happen. Brett is putting it all on the line, and his fate once again lies in the hands of the judges.
Brett appeared on Penn & Teller: Fool Us in 2016. He did not fool the duo.
Brett Loudermilk's audition in Episode 1504 consisted of swallowing various swords with all 3 judges pulling it out. Heidi Klum was not present for it, but Howie Mandel, Sofia Vergara, and Simon Cowell voted "Yes", sending him to the next round.
Brett Loudermilk automatically advanced to the Quarterfinals without performing in Episode 1508.
Brett Loudermilk's Quarterfinals performance in Episode 1509 consisted of performing a routine assisted by Heidi and Sofia. Heidi chose and signed a card in a deck, with Sofia shooting a crossbow across the stage at the deck in Brett's mouth. The crossbow broke, and Brett swallowed one of the arrows, pulling Heidi's card from his throat. Howie Mandel gave him a standing ovation. Brett finished in 4th, 5th or 6th place in America's Vote. In the Dunkin' Save, he received more online votes than Feng E and Double Dragon, advancing to the Semifinals in Episode 1510.
Brett Loudermilk's Semifinals performance in Episode 1519 consisted of performing a routine assisted by Howie based on a theme of objects commonly swallowed by children. Using an endoscopic camera, it correctly identified an object Sofia chose from a photo, which Brett regurgitated. Brett did not receive enough votes to advance to the Finals in Episode 1520, eliminating him from the competition along with Jonathan Goodwin instead of Bello Sisters.
- Brett is the first sword swallower act in the show's history to advance past the Quarterfinals.
- In Brett's Quarterfinal round, he was the only non-singing act to progress to the Semifinals.