Season
Episode
- Episode 1: Johnny Goes Nuts
- Episode 2: Johnny Daddy Day
- Episode 3: Johnny Cruise
- Episode 4: Rated J for Johnny
- Episode 5: Spotless Johnny
- Episode 6: Johnny vs. Bling-Bling: The Ultimate Battle
- Episode 7: Cat Scratch Johnny
- Episode 8: Johnny of the Deep
- Episode 9: Johnny Swellville
- Episode 10: Johnny Irresistible
- Episode 11: Johnny's Rat Race
- Episode 12: Black & White & Johnny All Over
- Episode 13: Lawn Gone Johnny
- Episode 14: Johnny's Ultimate Treehouse
- Episode 15: Johnny Goes Camping
- Episode 16: Johnny's World Prank Wars I
- Episode 17: How to Become a John-i Knight
- Episode 18: The Return of Johnny Super Smarty Pants
- Episode 19: Fangs a Lot Johnny
- Episode 20: Johnny Testosterone
- Episode 21: Johnny's Keys to Success
- Episode 22: Johnny's Winter Jacket
- Episode 23: Johnny Two-Face
- Episode 24: Johnny Susan, Susan Johnny
- Episode 25: Johnny Trick or Treat
- Episode 26: Nightmare on Johnny's Street
- Episode 27: My Dinner with Johnny
- Episode 28: Johnny Alternative
- Episode 29: Cool Hand Johnny
- Episode 30: Roller Johnny
- Episode 31: A Holly Johnny Christmas
- Episode 32: Johnny's First Annual Snowball
- Episode 33: Lakeside Johnny
- Episode 34: Johnny Germ Fighter
- Episode 35: Johnny's World Record
- Episode 36: Mush, Johnny, Mush
- Episode 37: Johnny's Treasure
- Episode 38: Extra Credit Johnny
- Episode 39: Johnny's Left Foot
- Episode 40: Johnny vs. The Tickler
- Episode 41: Bugged Out Johnny
- Episode 42: Johnny Test's Quest
- Episode 43: Johnny-O's
- Episode 44: It's Du-Kay Johnny
- Episode 45: Magic Johnny
- Episode 46: Dolly Johnny
- Episode 47: Johnny McCool
- Episode 48: It's an Invasion, Johnny
- Episode 49: It's All Relative, Johnny
- Episode 50: Johnny Rich
- Episode 51: Johnny X... Again? (JX9)
- Episode 52: Green Johnny
Johnny Test Season 5 Johnny's Ultimate Treehouse
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.
