Channel 4 quiz show of a high standard, in which fifteen contestants are whittled down to one winner each episode via general knowledge questions. It originally ran from 1988 to 2003, with William G. Stewart as presenter, and has since had repeats of selected series on Challenge. Fifteen to One was revived on Channel 4 in 2013: celebrity episodes have been presented by Adam Hills and other episodes by Sandi Toksvig.

The first Celebrity Fifteen to One special in 1990 had contestants that included Bob Holness (later identified by The Quest newsletter as a Knightmare fan), agony aunt Claire Rayner (revealed by Mark Knight at the 2014 Knightmare Convention to be the inspiration for his portrayal of Rothberry), Richard Whiteley (original Countdown host) and Carol Vorderman (Countdown co-host). Richard Whiteley returned as a contestant in the 1992 celebrity episode alongside Bullseye presenter Jim Bowen. One of 2015's Celebrity Fifteen to One episodes featured Isy Suttie, who had played Veruca/Daisy in the 2013 Geek Week episode of Knightmare).

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