SEASON FINALE: If you watch only one installment of this series each season, this is the one, because this is the one where a winner is crowned. But even then, when the finalists include an animal act and a children’s dance troupe (pictured), it’s kind of like watching a time-warp, jazzed-up episode of The Ed Sullivan Show. Only instead of Ed, you have Howard Stern. Also performing, though not competing: Justin Bieber.