| Episode credited cast: |
 | Dermot O'Leary | - | Himself - Presenter |
 | Simon Cowell | - | Himself - Judge |
 | Cheryl | - | Herself - Judge (as Cheryl Cole) |
 | Dannii Minogue | - | Herself - Judge |
 | Brian Friedman | - | Himself - Creative Director / Choreographer |
 | Whitney Houston | - | Herself - Special Guest |
 | Clive Davis | - | Himself - Special Guest |
| Rest of cast listed alphabetically: |
 | Rachel Adedeji | - | Herself - Contestant |
 | Briony Albert | - | Principal Dancer |
| Jamie Archer | - | Himself - Contestant |
| Yvie Burnett | - | Herself - Vocal Coach |
| Lloyd Daniels | - | Himself - Contestant |
| Peter Dickson | - | Himself - Voice Over (voice) |
| Miss Frank | - | Themselves - Contestants |
 | Jedward | - | Themselves - Contestants (as John & Edward) |
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