How much trouble could one imaginative boy, his faithful dog and two science-loving sisters possibly get into? Hmm, that sounds like a challenge!
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James Arnold Taylor
Johnny Test (voice) (40 episodes)
Trevor Devall
Dukey (voice) (40 episodes)
Ashleigh Ball
Mary Test (voice) (40 episodes)
Maryke Hendrikse
Susan Test (voice) (40 episodes)
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