The twentieth episode of Season 8, and the one hundred and eighty-eighth episode of America's Got Talent overall, aired on August 27, 2013. It was the first Semifinals episode and took place in New York, in Radio City Music Hall. 12 acts performed for 6 spots in the Finals. At the beginning of this episode, Nick Cannon told us that The KriStef Brothers had an accident and wouldn't be able to perform. Their were postponed for Episode 822 and were replaced for the night by Howie Mandel's Wild Card pick, Red Panda.