Because of scheduling conflicts with the filming of "The Guardian", Kutcher was unable to renew his contract for the eighth and final season of "That '70s Show", although he appeared in its first four episodes (credited as a special guest star) and returned for the series finale. Kutcher produced and starred in the 2010 action comedy, "Killers", in which he played a hitman. In May 2011, Kutcher was announced as Charlie Sheen's replacement on the series "Two and a Half Men".