Simon Cowell: The Next Act
- DDanny BrethertonSelf (archive footage), Self - Participant
- HHendrik ChristoffersenSelf (archive footage), Self - Participant
- JJosh OlliverSelf - Participant, Self (archive footage)
Simon CowellSelf - Host- LLauren SilvermanSelf
Savan KotechaSelf
Jason BoydSelf- JJohn FadareSelf - Participant, Self (archive footage)
- CCruz Lee-OjoSelf - Participant
- NNicolas AlvesSelf - Participant
- SSeán HaydenSelf - Participant
- FFilip JedlickaSelf - Participant
- JJake E-BSelf - Participant
- JJake G.Self - Participant
Samuel MeyerSelf - Participant- AAronSelf - Participant
- JJoe BoyleSelf - Participant
- LLeon JonesSelf - Participant
- EEvan Huntley-RobertsonSelf - Participant
- MMaxSelf - Participant
- EErikSelf - Participant
- NNateSelf - Participant
- JJudeSelf - Participant
KamilleSelf- EEric Philip CowellSelf
Liam PayneSelf (archive footage)
Niall Horan(Archive Footage)- AAlexSelf - Participant
- DDeanSelf - Participant
- RRossSelf - Participant
- TTaylorSelf - Participant
- CCormacSelf - Participant
- AAaravSelf - Participant
- AAdamSelf - Participant
- NNickSelf - Participant
- SSamSelf - Participant
- TTravisSelf - Participant
- TTomSelf - Participant
- AAlexSelf - Participant
- BBenSelf - Participant
- CCallumSelf - Participant
- YYomiSelf - Participant
- JJamesSelf - Participant
- HHarrisSelf - Participant
- LLoganSelf - Participant
- TTylerSelf - Participant