John Ralston is a Canadian actor. He debuted in an episode of Psi Factor in 1997. He later made notable guest appearances on La Femme Nikita and Highlander: The Raven. His first regular role on television was as Jack Berg on The City. After this, he made his big screen debut in the 2000 film Turn It Up. He next starred in the movie Khaled. In the 2000s, he mostly performed on TV films, as well as played Jack Avenir on Strange Days at Blake Holsey High. He then became best known for starring as George Venturi on the sitcom Life with Derek. At the same time, he had recurring roles on Instant Star and Friends and Heroes. He later played Ming the Merciless on the show Flash Gordon. He’s also widely known for playing Miles Hollingsworth II on Degrassi: The Next Generation.