Simon Cowell

Simon Cowell was a judge on the X Factor. In 2016, Eddie Redmayne accidentally called him looking for Pudsey, but Simon, said "it's a no from me" and hung up. (TV: Looking for Pudsey)

The Wire once took on the voice of Simon Cowell whilst attacking the Tenth Doctor through Max Wu's blue tooth speaker. Alice Wu recognised the voice due to its arrogant tone, with the Doctor citing the choice of mimicry to be fitting "if you're aiming for the essence of nastiness". (PROSE: Loose Wire)

Information from invalid sources
Cowell was once given a wedgie by a Krafayis. (NOTVALID: AAAGH!)

ITV's animated comedy sketch series featured a science fiction parody of  entitled Galaxy Idol, which saw the Fourth Doctor serve as a panelist alongside Cowell, with the TARDIS being parked at the Galaxy Idol space station. Though remaining silent as Cowell judges R2-D2, an admittedly biased Doctor says that he hated a performance by a grey Dalek before Simon Cowell gaves "four words", "ex-ter-min-ate", causing the Dalek to burst into tears whilst being consoled by Ant McPartlin.

Other matters
Simon Cowell played himself in Looking for Pudsey.