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.
| Name | Type | Role | |
|---|---|---|---|
| Simon Cowell | Writer | ||
| Jason Raff | Writer | ||
| Susan Boyle | Guest Star | ||
| Rascal Flatts | Guest Star | ||
| Leona Lewis | Guest Star | ||
| Cirque du Soleil | Guest Star | ||
| Shakira | Guest Star |