"I think you added too much barf!" -- Johnny

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"Oh my gosh! , this is bad!" – Dukey

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"Dukey Jekyll and Johnny Hyde"
Season 4, Episode 6a
United States Airdate: January 7, 2010
Canada Airdate: October 15, 2009
Title Reference: Dr. Jekyll and Mr. Hyde
Episode Guide
"The Johnnyminster Dog Show"
"Johnny's Trophy Case"

Dukey Jekyll and Johnny Hyde is the first part of 45th episode and the 89th episode over all.


Dukey drinks a liquid which makes him turn into a monster dog. To make matters worse, a dog catcher (and later Mr. Black and Mr. White) are after him. Will the Test Kids figure out a way to get their dog back to normal and save Dukey? Or will Dukey stay a monster dog forever and can they return him to normal before the Dog Catcher and the Military get him?


  • The battle armor that Johnny wears towards the end on the episode somewhat resembles the armor worn by the Master Chief, the main character of the popular video game series, "Halo".
  • Running Gag: The phrase "Man, I'm a lousy shot." was used everytime someone misfires a tranquilizer dart at the monster dog.
  • Clips from Join the Johnny Scouts, No Homework for Johnny and The Johnnyminster Dog Show are seen when Dukey remembers his fondest moments with Johnny.
  • The title refers to the book "The Strange Case of Dr. Jekyll and Mr. Hyde" which was a story about a man who invents a potion that when he drinks it, he turns into a monster.
  • The word Jekyll in the title card is misspelled as Jeckyll, possibly to avoid issues with copyright holders.


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