Kilbane joined the cast of MADtv in 1997 as a feature performer, for the third season. However, when David Herman left the show mid season, Kilbane was later promoted to a repertory performer status. Kilbane was known for many popular characters, such as the frequently appearing Stan McNer, a coffee addict with bulging eyes. Others include Nick Bendix, actor of Rocket Revengers, the Sheriff's deputy (The Son of Dolemite). He also became the second cast member to portray the Spishak salesman (David Herman was the first).