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SEASON 4

JOHNNY'S BIG DUMB SISTERS

Aired on 12/10/09
Johnny's Big Dumb Sisters: Susan and Mary have built a Uranium Cranium Mind Builder - a machine that can increase intelligence. Unfortunately Johnny switches it from genius to really dumb mode right before he accidentally zaps Susan and Mary. Johnny and Dukey need to work fast to get Susan and Mary back to their genius selves - Unfortunately they're out of the uranium that is needed to make the machine work.
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