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 10 ·
Phat Johnny
An accident in Eugene's lab leaves Johnny overweight like him. Johnny uses his weight to become a rapper and to get a video game that he wanted. However, karma is after him and ruins his experience.
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Episode 10 of season 2 of Johnny Test: “Phat Johnny”. Aired 2007-02-03. Watch it online free on ZapFlix.