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 28 ·
Who's Johnny
When Sissy considers Johnny too gross to help her in a science project, he begs Susan and Mary to change his personality.
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Episode 28 of season 4 of Johnny Test: “Who's Johnny”. Aired 2010-05-17. Watch it online free on ZapFlix.