Dexter is the troublemaker of the museum. He drives Larry insane by slapping him. He's a Capuchin Monkey of Africa

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Name: Dexter

Family: Doesn't say

Friends: Exhibits

Occupation: Driving Larry insane

Summary: Eventhough he's "cute", he's a lot of trouble.

Portrayed by: Crystal the monkey

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In Night at the Museum Battle of the Smithsonian, he's the cause for Larry, and all of the exhibits' troubles. He steals the tablet, and they're ALL in danger of Ahkmenrah's big brother, Khamumrah. Khamunrah wants the tablet to rule the world by using the tablet to bring back the army from the Underworld to Earth. However, Dexter proves once again, that eventhough he messed up, he learned from his mistake.