Season
Episode
- Episode 1: Johnny's New Baby Sisters
- Episode 2: Porta Johnny
- Episode 3: Join the Johnny Scouts
- Episode 4: Johnny BC
- Episode 5: Runaway Johnny
- Episode 6: Johnny on the Spot
- Episode 7: Dark Johnny
- Episode 8: No Homework for Johnny
- Episode 9: Papa Johnny
- Episode 10: The Johnnyminster Dog Show
- Episode 11: Dukey Jekyll and Johnny Hyde
- Episode 12: Johnny's Trophy Case
- Episode 13: Johnny's Amazing Cookie Company
- Episode 14: Johnny's Big Dumb Sisters
- Episode 15: My Johnny Guard
- Episode 16: Tom and Johnny
- Episode 17: The Quantum of Johnny
- Episode 18: Johnny Get Yer Gum
- Episode 19: Old School Johnny
- Episode 20: Johnny Degrees Below Zero
- Episode 21: Johnny Johnny
- Episode 22: Johnny Double Coupons
- Episode 23: X-Ray Johnny
- Episode 24: The Destruction of Johnny X
- Episode 25: iJohnny
- Episode 26: Johnny vs. The Mummy
- Episode 27: Johnny Grow Your Own Monster
- Episode 28: Who's Johnny
- Episode 29: Princess Johnny
- Episode 30: 99 Deeds of Johnny Test
- Episode 31: Johnny's Amazing Race
- Episode 32: Johnny Test in 3D
- Episode 33: Guess Who's Coming to Johnny's for Dinner
- Episode 34: Johnny's New BFF
- Episode 35: Johnny vs. Bling Bling IV
- Episode 36: Johnny's Big Sister Smackdown
- Episode 37: Sunshine Malibu Johnny
- Episode 38: Johnnyicle
- Episode 39: King Johnny
- Episode 40: Johnny Re-Animated
- Episode 41: Johnny Cakes
- Episode 42: Johnny Tube
- Episode 43: Sleepover at Johnny's
- Episode 44: Johnny's Got a Wart!
- Episode 45: Johnny's Royal Flush
- Episode 46: Johnny Test's Day Off
- Episode 47: Johnny & Dark Vegan's Battle Brawl Mania
- Episode 48: A Scholarship for Johnny
- Episode 49: Johnny Boat Racing
- Episode 50: Johnny Lock Down
- Episode 51: Good Ol' Johnny Test
- Episode 52: Johnny X Strikes Back Again
Johnny Test Season 4 Tom and Johnny
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.
