Whose Line Is It Anyway? is an improvisational radio program. The show consisted of a panel of four performers who create characters, scenes and songs on the spot, in the style of short-form improvisation games. Topics for the games were based on predetermined prompts from the host. This early incarnation of the show is notable as being the origin of the show's tradition of having the performers read the credits in an amusing style; as it was a radio show, it was necessary for somebody to read the credits, and it was decided that it might as well be done as part of the programme proper, rather than being done by a traditional BBC Radio announcer. The radio series consisted of six episodes, with Clive Anderson as host, with John Sessions and Stephen Fry as regulars along with Jon Glover, Rory Bremner, Jimmy Mulville, and more.