Young Johnny is gung-ho and full of courage. Johnny's brainiac twin sisters, Susan and Mary, use Johnny as their guinea pig for their outrageous scientific experiments. If they can dream it up, Johnny will do it; as long as his genetically engineered super dog, Dukey, can come along.
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| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | Johnny to the Center of the Earth | 2005-09-17 | 15 min |
| Season 1 | Episode 2 | Johnny X | 2005-09-17 | 15 min |
| Season 1 | Episode 3 | Johnny vs. Bling-Bling Boy | 2005-09-24 | 15 min |
| Season 1 | Episode 4 | Johnny Impossible | 2005-09-24 | 15 min |
| Season 1 | Episode 5 | Johnny Test: Party Monster | 2005-10-01 | 15 min |
| Season 1 | Episode 6 | Johnny Test: Extreme Crime Stopper | 2005-10-01 | 15 min |
| Season 1 | Episode 7 | Deep Sea Johnny | 2005-10-08 | 15 min |
| Season 1 | Episode 8 | Johnny and the Amazing Turbo Action Backpack | 2005-10-08 | 15 min |
| Season 1 | Episode 9 | Johnny and the Ice Pigs | 2005-10-29 | 15 min |
| Season 1 | Episode 10 | Johnny's House of Horrors | 2005-10-29 | 15 min |
| Season 1 | Episode 11 | Johnny's Super Smartypants | 2005-11-05 | 15 min |
| Season 1 | Episode 12 | Take Your Johnny to Work Day | 2005-11-05 | 15 min |
| Season 1 | Episode 13 | Johnny and the Mega Roboticles | 2005-11-12 | 15 min |
| Season 1 | Episode 14 | Johnny Gets Mooned | 2005-11-12 | 15 min |
| Season 1 | Episode 15 | Johnny Hollywood | 2005-11-19 | 15 min |
| Season 1 | Episode 16 | Johnny's Turbo Time Rewinder | 2005-11-19 | 15 min |
| Season 1 | Episode 17 | Return of Johnny X | 2005-11-26 | 15 min |
| Season 1 | Episode 18 | Sonic Johnny | 2005-11-26 | 15 min |
| Season 1 | Episode 19 | Dog Days of Johnny | 2006-02-11 | 15 min |
| Season 1 | Episode 20 | Johnny's Pink Plague | 2006-02-11 | 15 min |
| Season 1 | Episode 21 | Johnny's Extreme Game Controller | 2006-02-18 | 15 min |
| Season 1 | Episode 22 | Li'l Johnny | 2006-02-18 | 15 min |
| Season 1 | Episode 23 | Johnny vs. Brain Freezer | 2006-07-22 | 15 min |
| Season 1 | Episode 24 | Johnny's Big Snow Job | 2006-07-22 | 15 min |
| Season 1 | Episode 25 | Johnny Dodgeball | 2006-07-29 | 15 min |
| Season 1 | Episode 26 | Johnny and the Attack of the Monster Truck | 2006-07-29 | 15 min |
| Season 2 | Episode 1 | Hoist the Johnny Roger | 2006-10-28 | 15 min |
| Season 2 | Episode 2 | Johnny's Turbo Toy Force | 2006-10-28 | 15 min |
| Season 2 | Episode 3 | JTV | 2006-11-04 | 15 min |
| Season 2 | Episode 4 | Johnny vs. Bling-Bling Boy 2 | 2006-11-04 | 15 min |
| Season 2 | Episode 5 | Johnnyland | 2006-11-11 | 15 min |
| Season 2 | Episode 6 | Johnny's Got a Brand New Dad | 2006-11-11 | 15 min |
| Season 2 | Episode 7 | Saturday's Alright for Johnny | 2006-11-18 | 15 min |
| Season 2 | Episode 8 | Johnny Mint Chip | 2006-11-18 | 15 min |
| Season 2 | Episode 9 | Johnny's Pet Day | 2006-12-03 | 15 min |
| Season 2 | Episode 10 | Phat Johnny | 2006-12-03 | 15 min |
| Season 2 | Episode 11 | The Revenge of Johnny X | 2006-12-10 | 15 min |
| Season 2 | Episode 12 | The Enchanted Land of Johnnia | 2006-12-10 | 15 min |
| Season 2 | Episode 13 | 101 Johnnies | 2007-01-17 | 15 min |
| Season 2 | Episode 14 | Johnny Zombie Tea Party | 2007-01-17 | 15 min |
| Season 2 | Episode 15 | Johnny Test in Black & White | 2007-02-24 | 15 min |
| Season 2 | Episode 16 | Johnny the Kid | 2007-02-24 | 15 min |
| Season 2 | Episode 17 | Downhill Johnny | 2007-03-03 | 15 min |
| Season 2 | Episode 18 | Johnny Meets the Pork-Ness Monsters | 2007-03-03 | 15 min |
| Season 2 | Episode 19 | Johnny X Strikes Back | 2007-04-21 | 15 min |
| Season 2 | Episode 20 | Johnny vs. Super Soaking Cyborgs | 2007-04-21 | 15 min |
| Season 2 | Episode 21 | 00-Johnny | 2007-04-28 | 15 min |
| Season 2 | Episode 22 | Johnny of the Jungle | 2007-04-28 | 15 min |
| Season 2 | Episode 23 | Johnny vs. Smash Badger 3 | 2007-05-05 | 15 min |
| Season 2 | Episode 24 | Johnny Bee Good | 2007-05-05 | 15 min |
| Season 2 | Episode 25 | The Good, the Bad & the Johnny | 2007-05-12 | 15 min |
| Season 2 | Episode 26 | Rock-a-Bye Johnny | 2007-05-12 | 15 min |
| Season 3 | Episode 1 | Johnny vs. Bling-Bling Boy 3 | 2007-09-22 | 15 min |
| Season 3 | Episode 2 | Stinkin' Johnny | 2007-09-22 | 15 min |
| Season 3 | Episode 3 | Johnny X and the Attack of the Snowmen | 2007-09-29 | 15 min |
| Season 3 | Episode 4 | Johnny vs. Dukey | 2007-09-29 | 15 min |
| Season 3 | Episode 5 | Here Johnny, Here Boy | 2007-10-06 | 15 min |
| Season 3 | Episode 6 | Johnny Applesauce | 2007-10-06 | 15 min |
| Season 3 | Episode 7 | Johnny'mon | 2007-10-13 | 15 min |
| Season 3 | Episode 8 | Bath Time for Johnny | 2007-10-13 | 15 min |
| Season 3 | Episode 9 | Johnny Test: Monster Starter | 2008-01-26 | 15 min |
| Season 3 | Episode 10 | Johnny Holiday | 2007-11-03 | 15 min |
| Season 3 | Episode 11 | Coming to a Johnny Near You | 2007-11-10 | 15 min |
| Season 3 | Episode 12 | When Johnny Comes Marching Home | 2007-11-10 | 15 min |
| Season 3 | Episode 13 | Johnnyitis | 2007-12-01 | 15 min |
| Season 3 | Episode 14 | Johnny Mustache | 2007-12-01 | 15 min |
| Season 3 | Episode 15 | Johnny Fu | 2007-12-15 | 15 min |
| Season 3 | Episode 16 | Johnny Escape From Bling Bling Island | 2007-12-15 | 15 min |
| Season 3 | Episode 17 | Johnny's Monkey Business | 2008-01-26 | 15 min |
| Season 3 | Episode 18 | Johnny Bench | 2008-01-26 | 15 min |
| Season 3 | Episode 19 | Johnny Long Legs | 2008-02-02 | 15 min |
| Season 3 | Episode 20 | Johnny Test in Outer Space | 2008-02-02 | 15 min |
| Season 3 | Episode 21 | Johnny Kart Racing | 2008-02-16 | 15 min |
| Season 3 | Episode 22 | Johnny Smells Good | 2008-02-16 | 15 min |
| Season 3 | Episode 23 | Return of Johnny'mon | 2008-02-23 | 15 min |
| Season 3 | Episode 24 | Johnny Dukey Doo | 2008-02-23 | 15 min |
| Season 3 | Episode 25 | Johnny X: A New Beginning (JX6-a) | 2008-03-01 | 15 min |
| Season 3 | Episode 26 | Johnny X: The Final Ending (JX6-b) | 2008-03-01 | 15 min |
| Season 4 | Episode 1 | Johnny's New Baby Sisters | 2009-09-10 | 15 min |
| Season 4 | Episode 2 | Porta Johnny | 2009-09-10 | 15 min |
| Season 4 | Episode 3 | Join the Johnny Scouts | 2009-09-17 | 15 min |
| Season 4 | Episode 4 | Johnny BC | 2009-09-17 | 15 min |
| Season 4 | Episode 5 | Runaway Johnny | 2009-09-24 | 15 min |
| Season 4 | Episode 6 | Johnny on the Spot | 2009-09-24 | 15 min |
| Season 4 | Episode 7 | Dark Johnny | 2009-10-01 | 15 min |
| Season 4 | Episode 8 | No Homework for Johnny | 2009-10-01 | 15 min |
| Season 4 | Episode 9 | Papa Johnny | 2009-10-08 | 15 min |
| Season 4 | Episode 10 | The Johnnyminster Dog Show | 2009-10-08 | 15 min |
| Season 4 | Episode 11 | Dukey Jekyll and Johnny Hyde | 2009-10-15 | 15 min |
| Season 4 | Episode 12 | Johnny's Trophy Case | 2009-10-15 | 15 min |
| Season 4 | Episode 13 | Johnny's Amazing Cookie Company | 2009-11-26 | 15 min |
| Season 4 | Episode 14 | Johnny's Big Dumb Sisters | 2009-11-26 | 15 min |
| Season 4 | Episode 15 | My Johnny Guard | 2009-12-03 | 15 min |
| Season 4 | Episode 16 | Tom and Johnny | 2009-12-03 | 15 min |
| Season 4 | Episode 17 | Quantum of Johnny | 2009-12-10 | 15 min |
| Season 4 | Episode 18 | Johnny Get Yer Gum | 2009-12-10 | 15 min |
| Season 4 | Episode 19 | Old School Johnny | 2010-01-07 | 15 min |
| Season 4 | Episode 20 | Johnny Degrees Below Zero | 2010-01-07 | 15 min |
| Season 4 | Episode 21 | Johnny Johnny | 2010-02-04 | 15 min |
| Season 4 | Episode 22 | Johnny Double Coupon | 2010-02-04 | 15 min |
| Season 4 | Episode 23 | X-Ray Johnny | 2010-02-25 | 15 min |
| Season 4 | Episode 24 | The Destruction of Johnny X | 2010-02-25 | 15 min |
| Season 4 | Episode 25 | iJohnny | 2010-03-02 | 15 min |
| Season 4 | Episode 26 | Johnny vs. The Mummy | 2010-03-02 | 15 min |
| Season 4 | Episode 27 | Johnny Grow Your Own Monster | 2010-05-10 | 15 min |
| Season 4 | Episode 28 | Who's Johnny? | 2010-05-10 | 15 min |
| Season 4 | Episode 29 | Princess Johnny | 2010-05-24 | 15 min |
| Season 4 | Episode 30 | 99 Deeds of Johnny Test | 2010-05-24 | 15 min |
| Season 4 | Episode 31 | Johnny's Amazing Race | 2010-07-12 | 15 min |
| Season 4 | Episode 32 | Johnny Test in 3D | 2010-07-12 | 15 min |
| Season 4 | Episode 33 | Guess Who's Coming to Johnny's for Dinner | 2010-07-26 | 15 min |
| Season 4 | Episode 34 | Johnny's New BFF | 2010-07-26 | 15 min |
| Season 4 | Episode 35 | Johnny vs. Bling Bling IV | 2010-08-09 | 15 min |
| Season 4 | Episode 36 | Johnny's Big Sister Smackdown | 2010-08-09 | 15 min |
| Season 4 | Episode 37 | Sunshine Malibu Johnny | 2010-08-23 | 15 min |
| Season 4 | Episode 38 | Johnnyicle | 2010-08-23 | 15 min |
| Season 4 | Episode 39 | King Johnny | 2010-09-06 | 15 min |
| Season 4 | Episode 40 | Johnny Re-Animated | 2010-09-06 | 15 min |
| Season 4 | Episode 41 | Johnny Cakes | 2010-09-20 | 15 min |
| Season 4 | Episode 42 | Johnny Tube | 2010-09-20 | 15 min |
| Season 4 | Episode 43 | Sleepover at Johnny's | 2010-10-04 | 15 min |
| Season 4 | Episode 44 | Johnny's Got a Wart! | 2010-10-04 | 15 min |
| Season 4 | Episode 45 | Johnny's Royal Flush | 2010-10-18 | 15 min |
| Season 4 | Episode 46 | Johnny Test's Day Off | 2010-10-18 | 15 min |
| Season 4 | Episode 47 | Johnny & Dark Vegan's Battle Brawl Mania | 2010-11-01 | 15 min |
| Season 4 | Episode 48 | A Scholarship for Johnny | 2010-11-01 | 15 min |
| Season 4 | Episode 49 | Johnny Boat Racing | 2010-11-15 | 15 min |
| Season 4 | Episode 50 | Johnny Lock Down | 2010-11-15 | 15 min |
| Season 4 | Episode 51 | Good Ol' Johnny Test | 2010-11-29 | 15 min |
| Season 4 | Episode 52 | Johnny X Strikes Back Again | 2010-11-29 | 15 min |
| Season 5 | Episode 1 | Johnny Goes Nuts | 2011-06-13 | 15 min |
| Season 5 | Episode 2 | Johnny Daddy Day | 2011-06-13 | 15 min |
| Season 5 | Episode 3 | Johnny Cruise | 2011-06-20 | 15 min |
| Season 5 | Episode 4 | Rated J for Johnny | 2011-06-20 | 15 min |
| Season 5 | Episode 5 | Spotless Johnny | 2011-06-27 | 15 min |
| Season 5 | Episode 6 | Johnny vs. Bling-Bling: The Final Battle | 2011-06-27 | 15 min |
| Season 5 | Episode 7 | Cat Scratch Johnny | 2011-07-11 | 15 min |
| Season 5 | Episode 8 | Johnny of the Deep | 2011-07-11 | 15 min |
| Season 5 | Episode 9 | Johnny Swellville | 2011-07-18 | 15 min |
| Season 5 | Episode 10 | Johnny Irresistible | 2011-07-18 | 15 min |
| Season 5 | Episode 11 | Johnny's Rat Race | 2011-07-25 | 15 min |
| Season 5 | Episode 12 | Black & White & Johnny All Over | 2011-07-25 | 15 min |
| Season 5 | Episode 13 | Fangs a Lot Johnny | 2011-10-10 | 15 min |
| Season 5 | Episode 14 | Johnny Testosterone | 2011-10-10 | 15 min |
| Season 5 | Episode 15 | Lawn Gone Johnny | 2011-08-01 | 15 min |
| Season 5 | Episode 16 | Johnny's Ultimate Treehouse | 2011-08-01 | 15 min |
| Season 5 | Episode 17 | Johnny Goes Camping | 2011-08-08 | 15 min |
| Season 5 | Episode 18 | Johnny's World Prank Wars I | 2011-08-08 | 15 min |
| Season 5 | Episode 19 | How to Become a John-i Knight | 2011-08-15 | 15 min |
| Season 5 | Episode 20 | The Return of Johnny Super Smarty Pants | 2011-08-15 | 15 min |
| Season 5 | Episode 21 | Johnny's Keys to Success | 2011-08-22 | 15 min |
| Season 5 | Episode 22 | Johnny's Winter Jacket | 2011-08-22 | 15 min |
| Season 5 | Episode 23 | Johnny Two-Face | 2011-08-29 | 15 min |
| Season 5 | Episode 24 | Johnny Susan, Susan Johnny | 2011-08-29 | 15 min |
| Season 5 | Episode 25 | Johnny Trick or Treat | 2011-10-17 | 15 min |
| Season 5 | Episode 26 | Nightmare on Johnny's Street | 2011-10-17 | 15 min |
| Season 5 | Episode 27 | My Dinner with Johnny | 2011-11-14 | 15 min |
| Season 5 | Episode 28 | Johnny Alternative | 2011-11-14 | 15 min |
| Season 5 | Episode 29 | Cool Hand Johnny | 2011-11-28 | 15 min |
| Season 5 | Episode 30 | Roller Johnny | 2011-11-28 | 15 min |
| Season 5 | Episode 31 | A Holly Johnny Christmas | 2011-12-05 | 15 min |
| Season 5 | Episode 32 | Johnny's First Annual Snowball | 2011-12-05 | 15 min |
| Season 5 | Episode 33 | Lakeside Johnny | 2012-01-18 | 15 min |
| Season 5 | Episode 34 | Johnny Germ Fighter | 2012-01-18 | 15 min |
| Season 5 | Episode 35 | Johnny's World Record | 2012-03-20 | 15 min |
| Season 5 | Episode 36 | Mush, Johnny, Mush | 2012-03-20 | 15 min |
| Season 5 | Episode 37 | Johnny's Treasure | 2012-03-21 | 15 min |
| Season 5 | Episode 38 | Extra Credit Johnny | 2012-03-21 | 15 min |
| Season 5 | Episode 39 | Johnny's Left Foot | 2012-03-22 | 15 min |
| Season 5 | Episode 40 | Johnny vs. The Tickler | 2012-03-22 | 15 min |
| Season 5 | Episode 41 | Bugged Out Johnny | 2012-03-23 | 15 min |
| Season 5 | Episode 42 | Johnny Test's Quest | 2012-03-23 | 15 min |
| Season 5 | Episode 43 | Johnny O's | 2012-04-23 | 15 min |
| Season 5 | Episode 44 | It's Du-kay, Johnny | 2012-04-23 | 15 min |
| Season 5 | Episode 45 | Magic Johnny | 2012-06-06 | 15 min |
| Season 5 | Episode 46 | Dolly Johnny | 2012-06-06 | 15 min |
| Season 5 | Episode 47 | Johnny McCool | 2012-06-20 | 15 min |
| Season 5 | Episode 48 | It's an Invasion, Johnny | 2012-06-20 | 15 min |
| Season 5 | Episode 49 | It's All Relative, Johnny | 2012-07-25 | 15 min |
| Season 5 | Episode 50 | Johnny Rich | 2012-07-25 | 15 min |
| Season 5 | Episode 51 | Johnny X...Again? (JX9) | 2012-08-08 | 15 min |
| Season 5 | Episode 52 | Green Johnny | 2012-08-08 | 15 min |
| Season 6 | Episode 1 | Johnny on the Clock | 2013-04-23 | 15 min |
| Season 6 | Episode 2 | Johnny X-Factor (JX10) | 2013-04-23 | 15 min |
| Season 6 | Episode 3 | Johnnny Vets Dukey | 2013-05-21 | 15 min |
| Season 6 | Episode 4 | Johnny's No. 1 Fan | 2013-05-07 | 15 min |
| Season 6 | Episode 5 | How to Train Your Johnny | 2013-05-21 | 15 min |
| Season 6 | Episode 6 | Johnny and Clyde | 2013-05-21 | 15 min |
| Season 6 | Episode 7 | Johnny's Super Massive Kart Wheelies 7 | 2013-06-04 | 15 min |
| Season 6 | Episode 8 | Smooth Talking Johnny | 2013-06-04 | 15 min |
| Season 6 | Episode 9 | Johnny and the Beanstalk | 2013-06-18 | 15 min |
| Season 6 | Episode 10 | Johnny and Bling-Bling Bond Bond | 2013-06-18 | 15 min |
| Season 6 | Episode 11 | Johnny's Got Talent | 2013-07-02 | 15 min |
| Season 6 | Episode 12 | Johnny's Rough Around the Hedges | 2013-07-02 | 15 min |
| Season 6 | Episode 13 | Johnny's Head in the Clouds | 2013-07-16 | 15 min |
| Season 6 | Episode 14 | Stop in the Name of Johnny | 2013-07-16 | 15 min |
| Season 6 | Episode 15 | Johnny Opposite | 2013-07-30 | 15 min |
| Season 6 | Episode 16 | Johnny on the Job | 2013-07-30 | 15 min |
| Season 6 | Episode 17 | Johnny's 100th Episode | 2013-08-27 | 15 min |
| Season 6 | Episode 18 | Johnny's Next Episode | 2013-08-27 | 15 min |
| Season 6 | Episode 19 | Johnny's Supreme Theme | 2013-09-03 | 15 min |
| Season 6 | Episode 20 | Past and Present Johnny | 2013-09-03 | 15 min |
| Season 6 | Episode 21 | The Sands of Johnny | 2013-09-17 | 15 min |
| Season 6 | Episode 22 | Abominable Johnny | 2013-09-17 | 15 min |
| Season 6 | Episode 23 | Johnny vs. the Dukenator | 2013-10-02 | 15 min |
| Season 6 | Episode 24 | Johnny's Petting Zoo Posse | 2013-10-02 | 15 min |
| Season 6 | Episode 25 | The Johnny Who Saved Halloween | 2013-10-16 | 15 min |
| Season 6 | Episode 26 | Johnny's Zombie Bomb | 2013-10-16 | 15 min |
| Season 6 | Episode 27 | Johnny's New Super Mega Villain | 2013-10-30 | 15 min |
| Season 6 | Episode 28 | Johnny in Charge | 2013-10-30 | 15 min |
| Season 6 | Episode 29 | Johnny Unplugged | 2013-11-13 | 15 min |
| Season 6 | Episode 30 | Johnny's Monster Mash | 2013-11-13 | 15 min |
| Season 6 | Episode 31 | Johnny's Chipmunk Chit Chat | 2013-12-04 | 15 min |
| Season 6 | Episode 32 | A Picture's Worth 1000 Johnnies | 2013-12-04 | 15 min |
| Season 6 | Episode 33 | Dial J for Johnny | 2014-01-15 | 15 min |
| Season 6 | Episode 34 | Road Trip Johnny | 2014-01-15 | 15 min |
| Season 6 | Episode 35 | Code Cracking Johnny | 2014-02-05 | 15 min |
| Season 6 | Episode 36 | Johnny Goes Viral | 2014-02-05 | 15 min |
| Season 6 | Episode 37 | FrankenJohnny | 2014-02-18 | 15 min |
| Season 6 | Episode 38 | The Johnny Express | 2014-02-18 | 15 min |
| Season 6 | Episode 39 | Crash Test Johnny | 2014-02-25 | 15 min |
| Season 6 | Episode 40 | Johnny's Junky Trunk | 2014-02-25 | 15 min |
| Season 6 | Episode 41 | Super Johnny Action Federation | 2014-03-11 | 15 min |
| Season 6 | Episode 42 | Gil-Stopping Johnny | 2014-03-11 | 15 min |
| Season 6 | Episode 43 | Johnny With a Chance of Meatloaf | 2014-04-23 | 15 min |
| Season 6 | Episode 44 | It's Easter, Johnny Test! | 2014-04-23 | 15 min |
| Season 6 | Episode 45 | Future Johnny | 2014-05-07 | 15 min |
| Season 6 | Episode 46 | Dukey See Johnny Do | 2014-05-07 | 15 min |
| Season 6 | Episode 47 | Hair's Johnny | 2014-05-21 | 15 min |
| Season 6 | Episode 48 | Johnny's Hungry Games | 2014-05-21 | 15 min |
| Season 6 | Episode 49 | Tiny Johnny | 2014-06-04 | 15 min |
| Season 6 | Episode 50 | Johnny Goes Gaming | 2014-06-04 | 15 min |
| Season 6 | Episode 51 | The Last Flight of Johnny X (JX11) | 2014-06-18 | 15 min |
| Season 6 | Episode 52 | Johnny's Last Chapter | 2014-06-18 | 15 min |
| Production | Toper Taylor | Executive Producer |
| Production | Michael Hirsh | Executive Producer |
| Production | Scott Fellows | Producer |
| Production | Scott Fellows | Executive Producer |
