The multi-talented entertainer-producer-comedian Nick Cannon joins as the new host. The series will continue to be presided over by the explosive combination of celebrity judges Sharon Osbourne, Piers Morgan and David Hasselhoff.
The third round of auditions continues.
Week four finds the judges still auditioning the acts.
The auditions continue as the next group of performers head to the stage.
The seventh round of auditions are held for hopefuls to showcase their talents.
The ninth round of auditions continue.
After a final L.A. performance from the Beale Street Flippers wowed the judges and audience, the last 15 minutes of this episode was padded with a "Susan Boyle Daring To Dream: A Meredith Vieira Exclusive" interview from London.
-- Final Countdown
Contestants who made it through the first round of auditions find themselves in Las Vegas, in hopes of advancing to the Top 40 out of 160 hopefuls.
The Vegas Verdicts continue as the judges select their Top 40.
The first Ten of the Top 40 contestants perform live in Hollywood, as the acts inch closer to a million dollars based on your vote!
The votes are in and five acts from the previous night move on to make the Top 20. Mariah Carey performs.
The second Ten of the Top 40 contestants perform for a chance to win the $1 million prize.
Five more acts move into the Top 20.
The Top 40 acts have been narrowed to 10 and are featured in the fourth performance show.
A review of last night's action and the remaining five acts receive a position in the Top 20.
The semifinals begin as the first 10 acts from the Top 20 perform.
The results show will choose four acts to move on to the finals. Also, David Hasselhoff gives a performance.
Ten more semifinal acts from the Top 20 perform on stage.
10 finalists are featured in this last round of performance episodes.
Season four ends with the winner being revealed and the $1 million being awarded. Also, Susan Boyle, from Britain's Got Talent, pop-singer Shakira, English singer Leona Lewis, country stars Rascal Flatts and Cirque Du Soleil.