There are two teams – Team A and Team B. Each team has a regular team captain – originally Mark Lamarr and Ulrika Jonsson – and two celebrity guests on each team. Lamarr left the series in 1997 as he disliked being in too many quiz shows at once (at the time he was hosting "Never Mind the Buzzcocks"), and was replaced by novelist Will Self when the series returned in 2002. At the same time comedian Johnny Vegas was brought in as a regular guest on Jonsson's team, where he had a pint of Guinness on his desk where all the other contestants had water. Will Self was replaced by dead-pan comic, Jack Dee for the 2008 15th Anniversary Special and for the 2009 series, which also saw Lucas' character, George Dawes, replaced by Angelos Epithemiou, a creation of comedian Renton Skinner. Contestants are often addressed by their surnames, in reference to "University Challenge".