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).
Kilbane impressed with numerous impersonations, which included Al Gore, Howard Stern, Luke Perry, Marilyn Manson, Sean Connery, Mel Gibson (as Martin Riggs from "Lethal Weapon"), Arnold Schwarzenegger, Jay Leno, Jack Nicholson, Desi Arnaz (as Ricky Ricardo from "I Love Lucy"), Michael Richards (as Cosmo Kramer from "Seinfeld"), Bob Saget, Donald Trump, Tom Bergeron, Ted Koppel, Robin Williams, Antonio Banderas, Leonard Nimoy (as Mr. Spock), Rob Zombie, Charlton Heston, Andy Griffith, Tommy Tune, Michael Imperioli (as Christopher Moltisanti from "The Sopranos"), Billy Bob Thornton (as Karl Chiders from Sling Blade), Stone Phillips, Michael Eisner, and Brad Pitt.
Despite being a cast member on MADtv, Kilbane did not limit himself and often did side projects. For example, while on summer hiatus from MADtv, he co-starred in the Universal film New Jersey Turnpikes with Kelsey Grammer and former MADtv castmember Orlando Jones. After three years on the show, Kilbane left MADtv at the end of season five.
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