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 36 ·
Johnny's Big Sister Smackdown
Susan and Mary both want Gil to go on a date with them, so they put up a wrestling match using rough guts (Susan uses Johnny's while Mary uses a lion's), but it leads to destructive results.
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Episode 36 of season 4 of Johnny Test: “Johnny's Big Sister Smackdown”. Aired 2010-08-16. Watch it online free on ZapFlix.