Johnny Test is an American-Canadian animated television series produced by Warner Bros. Animation for the first season and by Cookie Jar Entertainment for the remainder of the series. It premiered on Kids' WB on September 17, 2005, which continued to air the series through its second and third seasons. The rest of the series aired on Cartoon Network starting on January 7, 2008, in the United States and internationally. In Canada, the series aired on Teletoon, premiering September 8, 2006.