Johnny Test
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.
Season 2 · Episode 25 ·
The Good, the Bad & the Johnny
To control Johnny's frequent bad behavior, the girls split his bad genes to make his genes 100% good. The bad gene later gets a life of its own, making two Johnnys, one nice and one evil.
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Episode 25 of season 2 of Johnny Test: “The Good, the Bad & the Johnny”. Aired 2007-05-12. Watch it online free on ZapFlix.