Sean Masterson was an improvisational performer on which Drew Carey's show?
Sean Masterson: Sean Masterson is a comedy actor, writer, director and producer known for his work with Drew Carey, writing on "The Drew Carey Show", and as an improvisational performer on "Whose Line Is It Anyway?" Sean Masterson:  spin-offs "Drew Carey's Green Screen Show", and "Drew Carey's Improv-A-Ganza". Drew Carey's Improv-A-Ganza: Drew Carey's Improv-A-Ganza is an improvisational comedy television program that aired in the United States on the Game Show Network.
"Drew Carey's Improv-A-Ganza"