Whose Line Is It Anyway? (often known as simply Whose Line?) is an American improvisational comedy show, which was originally hosted by Drew Carey on ABC and ABC Family and ran from August 5, 1998 to December 15, 2007.
The series is a spin-off of the British show of the same name and features Ryan Stiles, Colin Mochrie, and Wayne Brady as its regular performers with the fourth seat occupied by a guest panelist. All three regulars appeared on the British series; Stiles and Mochrie were regulars there as well while Brady was a frequent guest on the final season which moved production from London to Hollywood. [Wikipedia]