| Episode credited cast: |
 | Dermot O'Leary | - | Himself - Presenter |
 | Gary Barlow | - | Himself - Judge |
 | Sharon Osbourne | - | Herself - Judge |
 | Nicole Scherzinger | - | Herself - Judge |
 | Louis Walsh | - | Himself - Judge |
| Rest of cast listed alphabetically: |
 | 2 Shoes | - | Themselves - Performers |
| Sam Bailey | - | Herself - Contestant |
 | Beyoncé | - | Herself (as Beyoncé Knowles) |
 | Kitty Brucknell | - | Herself - Performer |
| Rylan Clark-Neal | - | Himself - Performer (as Rylan Clark) |
| Diva Fever | - | Himself - Performer |
| Shane Filan | - | Himself - Special Guest |
| Wagner Fiuza-Carrilho | - | Himself - Performer (as Wagner) |
 | Caroline Flack | - | Herself - Backstage Presenter |
| Luke Friend | - | Himself - Contestant |
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