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 4 ·
Johnny vs. Bling-Bling Boy 2
Eugene creates a device that turns himself, Johnny, and Dukey into young children, interfering with Johnny's video game showdown with Sissy.
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Episode 4 of season 2 of Johnny Test: “Johnny vs. Bling-Bling Boy 2”. Aired 2006-11-04. Watch it online free on ZapFlix.