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Cowell also appeared on the one-off World Idol programme in 2003, where it became clear that each country's version of the Idol had attempted to come up with its own "Simon Cowell" type personality.
He has judged on the British TV talent competition series Pop Idol, The X Factor and Britain's Got Talent, and the American TV talent competition shows American Idol, The X Factor and America's Got Talent.
Cowell returned for a fourth series on 18 August 2007 alongside Osbourne, Walsh and new judge, Dannii Minogue.
Walsh had previously been sacked from the judging panel by Cowell for the fourth series, and was subsequently replaced by Brian Friedman, who was a judge on Grease Is the Word.
Cowell returned for series 6 and 7 as well, although series 7 was to be his last, as he left in 2011 in order to launch The X Factor in America.
After placing third in the seventh series of The X Factor in the UK, boyband One Direction signed to Cowell's label in 2011, and the group have gone on to top singles and album charts worldwide.