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 14 ·
Johnny's Big Dumb Sisters
The twins' latest invention accidentally makes them dumb thanks to Johnny right before their scholarship interview.
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Episode 14 of season 4 of Johnny Test: “Johnny's Big Dumb Sisters”. Aired 2009-11-26. Watch it online free on ZapFlix.