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The April Fools' Day Monkey Marathon was an special 15-hour April Fools marathon that aired on Cartoon Network on April 1, 2003 from 8:00 AM to 11:00 PM, replaced Toonami, during April Fools' Day. The marathon shows the monkeys were taking over the network with the monkey-related episodes of the shows by the new network president, Jimbo.

However, the 24-hour Ape-Reel Fools Day marathon was on the Boomerang channel from April 1, 2008 to April 1, 2012 at 6:00 AM to 6:00 AM.

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