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Season 1 of Johnny Test premiered on September 17, 2005.

Johnny Test is a Canadian/American animated television series. It premiered on Kids' WB, on The WB Television Network, on September 17, 2005. The series currently airs in the United States on Cartoon Network, as of January 7, 2008, and in Canada on Teletoon, as of October 28, 2006. The show was produced by Cookie Jar Entertainment for its second and later seasons. The series is rated TV-Y7 for the first four seasons, and TV-Y7-FV for the fifth.

Johnny Test started its first season on Kids' WB on September 17, 2005 with the first episodes "Johnny to the Center of the Earth" and "Johnny X" and ended on July 29, 2006 with episodes "Johnny Dodgeball" and "Johnny and the Attack of the Monster Truck". This was the only season to be traditionally animated, as the next seasons are animated in Flash, in order to save the show's budget money.

This season, along with season 2, was released on DVD in a bundle on February 15, 2011 in Region 1. It was also released on DVD on February 21, 2008 in Region 2.

Season 2 of Johnny Test premiered on October 28, 2006.

Johnny Test is a Canadian/American animated television series. It premiered on Kids' WB, on The WB Television Network, on September 17, 2005. The series currently airs in the United States on Cartoon Network, as of January 7, 2008, and in Canada on Teletoon, as of October 28, 2006. The show was produced by Cookie Jar Entertainment for its second and later seasons. The series is rated TV-Y7 for the first four seasons, and TV-Y7-FV for the fifth.

Johnny Test started its second season on October 28, 2006 with "Hoist the Johnny Roger" and "Johnny's Turbo Toy Force" and ended on May 12, 2007 with episodes "The Good, the Bad, and the Johnny" and "Rock-a-Bye Johnny".

This season, along with its first season, was released on DVD in a bundle on February 15, 2011 in Region 1.

This season marks the first appearance for Ashleigh Ball as the new voice of Mary Test, Sissy Blakely, and Missy.

Season 3 of Johnny Test premiered on September 22, 2007.

Johnny Test is a Canadian/American animated television series. It premiered on Kids' WB, on The WB Television Network, on September 17, 2005. The series currently airs in the United States on Cartoon Network, as of January 7, 2008, and in Canada on Teletoon, as of October 28, 2006. The show was produced by Cookie Jar Entertainment for its second and later seasons. The series is rated TV-Y7 for the first four seasons, and TV-Y7-FV for the fifth.

Johnny Test started its third season on September 22, 2007 with "Johnny vs. Bling-Bling Boy 3" and "Stinkin' Johnny" and ended on March 1, 2008 with episodes "Johnny X: A New Beginning" and "Johnny X: The Final Ending".

This season, along with the fourth season, was released on DVD in a bundle on September 13, 2011 in Region 1.

Season 4 of Johnny Test premiered on November 9, 2009.

Johnny Test is a Canadian/American animated television series. It premiered on Kids' WB, on The WB Television Network, on September 17, 2005. The series currently airs in the United States on Cartoon Network, as of January 7, 2008, and in Canada on Teletoon, as of October 28, 2006. The show was produced by Cookie Jar Entertainment for its second and later seasons. The series is rated TV-Y7 for the first four seasons, and TV-Y7-FV for the fifth.

Johnny Test started its fourth season on September 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 and Ashleigh Ball as the voices of Dukey, Mary Test, and Sissy Blakely, although Ball returns later to resume her roles in Season 6.

This season, along with the third season, was released on DVD in a bundle on September 13, 2011 in Region 1.

Season 5 of Johnny Test premiered on June 13, 2011.

Johnny Test is a Canadian/American animated television series. It premiered on Kids' WB, on The WB Television Network, on September 17, 2005. The series currently airs in the United States on Cartoon Network, as of January 7, 2008, and in Canada on Teletoon, as of October 28, 2006. The show was produced by Cookie Jar Entertainment for its second and later seasons. The series is rated TV-Y7 for the first four seasons, and TV-Y7-FV for the fifth.

On August 24, 2010, it was announced that Johnny Test was renewed for a fifth season. The renewal brought up the series total to 91 episodes.

Johnny Test started its fifth season on June 13, 2011, in the US. This was the first season to premiere on Cartoon Network first. This is also the first season for Trevor Devall as the new voice of Dukey, and Brittney Wilson, who departed from the show after season 1, to return to play Mary Test, Sissy Blakely, and Missy. In August 2012, Netflix released the fifth season of Johnny Test as part of its Cartoon Network series releases.

Season 6 of Johnny Test premiered on April 23, 2013.

Johnny Test is a Canadian animated television series. It premiered on Kids' WB, on The WB Television Network, on September 17, 2005. The series currently airs in the United States on Cartoon Network, as of January 7, 2008, and in Canada on Teletoon, as of October 28, 2006. The show was produced by Cookie Jar Entertainment for its second and later seasons. The series is rated TV-Y7 for the first four seasons, and TV-Y7-FV for the fifth.

The sixth season of Johnny Test was ordered in the early March season. It began airing on April 3, 2013, starting with the episode "Johnny on the Clock" on Cartoon Network in the United States.

This season will feature its 100th episode, making it the first Teletoon series and the fourth Cartoon Network to pass the 100-episode milestone. According to creator Scott Fellows, the 100th episode will be a half-hour special.

This season is the first to broadcast in high-definition on Cartoon Network in the United States.

This season also features the re-appearance of Ashleigh Ball, who departed from the show after the fourth season, due to working on other projects.