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 4 · Episode 9 ·
Papa Johnny
Susan and Mary switch Johnny and Hugh's brains after the two make a bet that involves taking on each other's lives.
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Episode 9 of season 4 of Johnny Test: “Papa Johnny”. Aired 2009-10-08. Watch it online free on ZapFlix.