[Z]

Boys: Mentored by Dannii Minogue.
- Tabby Callaghan (Series 1)
- Shayne Ward (Series 2)
- Joe McElderry (Series 6)

Girls: Mentored by Louis Walsh.
- Leona Lewis (Series 3)
- Alexandra Burke (Series 5)
- Laura White (Series 5)

Overs: Mentored by Simon Cowell.
- Ruth Lorenzo (Series 5)
- Danyl Johnson (Series 6)
- Beverley Trotman (Series 4)

Groups: Mentored by Cheryl Cole.
- Hope (Series 4)
- JLS (Series 5)
- Miss Frank (Series 6)