Belleville became the youngest person to tape his own Comedy Now! special for CTV. He also appeared in CBC's The Sean Cullen Show and the movie Going the Distance. He was also "Slime Master Ryan" on the YTV Canadian show "UH OH!". Belleville portrayed Eddie in the 2004 Disney Channel Original Movie Stuck in the Suburbs and had a starring role in 2008 as Finn in Finn on the Fly. In 2011, he co-wrote and starred in the Canadian sitcom, Almost Heroes. He also voices Holger Holghart in the children's TV show, Detentionaire. He played the recurring character Jasper on the Fox TV series Life on a Stick. and also appeared on the CTV show, Satisfaction.