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Audition Show #1 New York, Chicago, Seattle
Episode number: 1
Overview: 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.
Audition Show #2 Seattle(2), Miami
Episode number: 2
Overview: The judges travel to Miami for the first time in AGT audition history, in hopes of finding the next million-dollar act.
Audition Show #3 New York(2), Chicago(2)
Episode number: 3
Overview: The coast-to-coast auditions continue as the judges search for the next million-dollar act.
Audition Show #4 Houston, Miami(2)
Episode number: 4
Overview: The judges continue their search for the next million dollar act.
Audition Show #5 Los Angeles
Episode number: 5
Overview: The judges continue their coast-to-coast search for the next big thing.
Audition Show #6 Houston(2)
Episode number: 6
Overview: The judges continue their coast-to-coast search for the next big thing.
Audition Show #7 New York(3)
Episode number: 7
Overview: Auditions are now being held in New York City. Will the judges like what they see?
Audition Show #8 Seattle(3)
Episode number: 8
Overview: Performance showcases are featured in the eighth audition installment.
MySpace.com audition show
Episode number: 9
Overview: Performance showcases are featured in the ninth audition installment.
Final audition show
Episode number: 10
Overview: Performance showcases are featured in the 10th and final audition installment.
Vegas Verdicts (1)
Episode number: 11
Overview: 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.
Vegas Verdicts (2)
Episode number: 12
Overview: In the second "Vegas Verdicts" installment, the judges debate the fates of the hopeful contestants to determine the Top 40 acts.
Live Performances (1)
Episode number: 13
Overview: Ten of the Top 40 acts showcase their talents in the first performance edition.
Results (1)
Episode number: 14
Overview: 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.
Live Performances (2)
Episode number: 15
Overview: Ten acts from the Top 40 take to the stage in the second performance installment.
Results (2)
Episode number: 16
Overview: 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.
Live Performances (3)
Episode number: 17
Overview: The third performance episode showcases 10 acts from the Top 40.
Results (3)
Episode number: 18
Overview: Five acts win a slot in the sought-after Top 20 in a results show. Daughtry and Ashley Tisdale perform.
4th Ten of Top 40 Perform (live)
Episode number: 19
Overview: The Top 40 acts have been narrowed to 10 and are featured in the fourth performance show.
4th Results Show: Final 5 move on to Top 20 (live)
Episode number: 20
Overview: Five final acts win a position in the Top 20 in a results show.
Semifinals, Group 1
Episode number: 21
Overview: The semifinals kick off with the first 10 acts from the Top 20 taking the stage.
Semifinals, Group 1 Results
Episode number: 22
Overview: 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.
Semifinals, Group 2
Episode number: 23
Overview: Ten semifinal acts from the Top 20 perform.
Semifinals, Group 2 Results
Episode number: 24
Overview: 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.
Final Performances
Episode number: 25
Overview: The final performance episode features the 10 finalists in showcases.
Final Results
Episode number: 26
Overview: 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.