The eighteenth episode of Season 18, and the four hundred and twenty-sixth episode of America's Got Talent overall, was aired on September 19, 2023. It was the last of five Semifinals performance episodes and took place at the Pasadena Civic Auditorium. 11 acts performed for 2 spots in the Finals.
Howie intentionally pressed Heidi’s buzzer during Trailer Flowers, as a way to signal his dislike to the act, however sarcastically said afterwards that he enjoyed the performance and would not press his buzzer in the live shows. This is due to the social media backlash when he buzzed acts prior.
This episode is the second of only two Semifinals of this season where the acts who performed last were not Golden Buzzer acts, it was preceded by Episode 1816.