An octochamp is a contestant who wins all eight of their heat games. The concept has existed since the show began, but no one achieved it until William Bradford's run in Series 3. Each series typically has only a few octochamps, and eight wins has been adequate to qualify for the finals in all series to date.
With the introduction of the 15 round format in Series 46, the threshold was changed to six wins, and such players were known as viscounts. Only six viscounts exist, however, because this reduction did not sit well with fans, and the original rules were reintroduced in Series 47. Tom Hargreaves, whose run began on Boxing Day 2001, became the first 15-round octochamp.