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Overview
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.
Seasons
Specials
Season 1
200526 episodes
Season 2
200626 episodes
Season 3
200726 episodes
Season 4
200952 episodes
Season 5
201152 episodes
Season 6
201352 episodes
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