<P> In February 2013, Ryan Stiles revealed in an interview that he would be returning to Los Angeles in April for a new season of Whose Line, hosted by Aisha Tyler and featuring the original cast of the U.S. version . Colin Mochrie would later confirm the revival . </P> <P> Whose Line Is It Anyway? returned to television, this time on The CW, with Colin Mochrie, Ryan Stiles, and Wayne Brady, and Aisha Tyler taking the role of the host . In addition to the traditional rotating fourth improv player (often drawn from same pool of regulars that appeared on the original show), a new feature was that of a "special guest". This fifth player would not necessarily have an improv background, but would still participate in some of the improv games . </P> <P> The initial summer run was made up of twelve half - hour episodes with the three veteran players joined by a featured player, along with a different special guest for each episode who would play in some of the games . </P> <P> On July 29, 2013, The CW announced that it had renewed the show for a 24 - episode season, airing Fridays at 8 ET / PT starting March 21, 2014, due to solid ratings . Illness prevented Stiles from appearing in two season 10 episodes, the first Whose Line shows he had missed in nearly 20 years, dating back to the original British series . Frequent guest Greg Proops filled in for Stiles on these occasions . </P>

The cast of whose line is it anyway