Whose Line Is It Anyway? is an American improvisational comedy television series, and is an adaptation of the British series of the same name. It originally aired on ABC and ABC Family from August 5, 1998 to December 15, 2007, hosted by Drew Carey. A revival of the show, hosted by Aisha Tyler, began airing on The CW on July 16, 2013. Colin Mochrie, Ryan Stiles and Wayne Brady have been permanent performers on the show since the first season. The fourth seat is occupied by a guest panelist. In May 2024, the show was renewed for a twenty-first season which premiered on September 6, 2024. From Wikipedia