List of The X Factor finalists (UK series 1)

The first series of The X Factor was broadcast on ITV from 4 September to 11 December 2004. It was won by Steve Brookstein, who went on to have some chart success, with runners-up G4 achieving two platinum albums before splitting up in 2007.Simon Cowell was the winning mentor.

Although Brookstein won the series, Cowell later admitted that G4 – mentored by Louis Walsh – were the real winners of the show. Brookstein and Cowell reportedly fell out over Cowell's insistence that he record covers versions, rather than self-penned material, leading to him being dropped from Sony BMG, and his name being little-mentioned in subsequent series of the show.

Sharon Osbourne was in charge of the 16–24s.

Trevor John "Tabby" O'Callaghan (born 22 April 1981 in Sligo, Ireland) is an Irish rock singer who had previously sung with future Westlife members Kian Egan and Mark Feehily. He was also with Petronella before joining DZ5, who auditioned for The X Factor, unaware that the show's willingness to accept bands only applied to vocal groups. The judges advised Callaghan to audition as a solo singer, and he was selected by Sharon Osbourne to be one of her acts at the live finals, finishing in third place overall.

Callaghan later revealed that he had been advised by the show's producers to drop the 'O' in his surname to make it sound more commercial and less Irish. In 2006 he supported Rod Stewart on tour, toured with new band The Tsars, and released the single "Take A Swing".

Cassie Compton was the youngest contestant on Series One of The X Factor. On the night she was eliminated, the seventeen-year-old's rendition of "All By Myself" failed to impress either the judges, particularly Cowell, who believed she was more of a West End singer.

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