Episode 1
The talent show's fourth season opens with preliminary auditions taped in theaters across the country. Nick Cannon is the new host, replacing Jerry Springer. David Hasselhoff, Sharon Osbourne and Piers Morgan return as the judges.
Episode 2
The judges travel to Miami for the first time in AGT audition history, in hopes of finding the next million-dollar act.
Episode 3
The coast-to-coast auditions continue as the judges search for the next million-dollar act.
Episode 4
The judges continue their search for the next million dollar act.
Episode 5
The judges continue their coast-to-coast search for the next big thing.
Episode 6
Episode 7
Auditions are now being held in New York City. Will the judges like what they see?
Episode 8
Performance showcases are featured in the eighth audition installment.
Episode 9
Performance showcases are featured in the ninth audition installment.
Episode 10
Performance showcases are featured in the 10th and final audition installment.
Episode 11
In the first "Vegas Verdicts" edition, winning acts from the preliminary auditions advance to Las Vegas in the hope of securing a coveted position in the Top 40, with the judges debating their show-biz fate.
Episode 12
In the second "Vegas Verdicts" installment, the judges debate the fates of the hopeful contestants to determine the Top 40 acts.
Episode 13
Ten of the Top 40 acts showcase their talents in the first performance edition.
Episode 14
The first five winning acts are selected for the Top 20 in a results edition. Mariah Carey performs, as does ventriloquist and Season 2 winner Terry Fator.
Episode 15
Ten acts from the Top 40 take to the stage in the second performance installment.
Episode 16
Five winning acts are selected to the coveted Top 20 in a results edition. Electro hip-hop duo LMFAO and comic illusionists Penn and Teller perform.
Episode 17
The third performance episode showcases 10 acts from the Top 40.
Episode 18
Five acts win a slot in the sought-after Top 20 in a results show. Daughtry and Ashley Tisdale perform.
Episode 19
The Top 40 acts have been narrowed to 10 and are featured in the fourth performance show.
Episode 20
Five final acts win a position in the Top 20 in a results show.
Episode 21
The semifinals kick off with the first 10 acts from the Top 20 taking the stage.
Episode 22
Four acts are selected to advance to the finals in a results edition. David Hasselhoff performs, as do the Muppets' Kermit the Frog and Miss Piggy.
Episode 23
Ten semifinal acts from the Top 20 perform.
Episode 24
A results edition reveals five winning acts. Members of the stage show "Jersey Boys"---a musical depicting the life of the pop group Frankie Valli and the Four Seasons---perform a medley of tunes from the show.
Episode 25
The final performance episode features the 10 finalists in showcases.
Episode 26
The winning act is revealed in the Season 4 finale. The victor scores $1 million. Performers include "Britain's Got Talent" phenom Susan Boyle; pop songstress Shakira; English singer Leona Lewis; country's Rascal Flatts; and Cirque du Soleil.
