The fourth season of the animated television series Johnny Test premiered on November 10, 2009, containing 26 full episodes. It was the first season to premiere on Teletoon first. This is the first season to be produced in high definition. This season began airing on Cartoon Network on November 9, 2009. This would be the final season for Louis Chirillo as Dukey and Mr. Teacherman. According to the credits, Warner Bros. still owns its trademark.
This season, along with the third season, was released on DVD in a bundle on September 13, 2011 in Region 1.
Cast James Arnold Taylor as Johnny Test Louis Chirillo as Dukey Ashleigh Ball as Mary Test Maryke Hendrikse as Susan Test
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