Johnny Test Characters  

Learn more about all the Johnny Test characters on Cartoon Network. Johnny Test is always ready to test any crazy experiments his genius sisters Mary and Susan come up with. Joined by Dukey, who's both a loyal dog and best friend, Johnny never knows what kind of strange powers or weird side effects will happen when he becomes a test subject in his sisters' laboratory. Hopefully, his arch rival Bling-Bling Boy doesn't show up.