<P> Larry soon discovers that at night, the museum's exhibits come to life and cause havoc for him . Amongst the lively exhibits are a playful Tyrannosaurus skeleton named Rexy; a mischievous capuchin monkey named Dexter who destroys the instructions; the warring factions of cowboys and legionnaires led by Jedediah and General Octavius; violent Attila the Hun and his army; a talking Easter Island Head that desires gum who calls Larry "dum dum"; the fire - seeking neanderthals; and a wax model of Theodore Roosevelt, who is in love with Sacagawea . </P> <P> Roosevelt explains to Larry that the exhibits have come to life every night since the arrival of an Egyptian artifact, the Tablet of Akhmenrah, the mummified pharaoh trapped in his sarcophagus . He also explains to Larry that as night guard, it is his job to make sure that no exhibit sets foot out of the museum, otherwise they will disintegrate into dust if the sun rises while they are outside . The next day, Cecil advises Larry to research history to make up for the instructions' destruction . He studies in libraries and from Rebecca . Larry puts his new knowledge to good use on his second night, but some of his plans backfire and the neanderthals set their exhibit on fire, leading to one becoming dust after venturing outside . After having doubts and almost getting fired the next day, Larry offers to introduce Sacagawea to Rebecca, but she thinks he is mocking her . </P> <P> On his third night, Larry brings Nick to the museum to watch the exhibits come to life, but they strangely do not . They catch Cecil, Gus, and Reginald stealing artifacts, who explain the tablet's magic has allowed them to feel physically young in their old age, and plot to frame Larry for the theft while they enjoy a happy retirement . Nick activates the tablet, but Cecil steals it, locking Larry and Nick in the Egyptian exhibit . They free Akhmenrah, and rally the exhibits to stop the thieves and retrieve their colleagues who fled out into Central Park . Gus and Reginald are captured, but Cecil escapes by stagecoach . </P> <P> Larry and several exhibits give chase, where they stop Cecil and recover the tablet, using its magic to escort all of the exhibits back into the museum before sunrise . Rebecca witnesses this and makes amends with Larry and is subsequently introduced to Sacagawea . The next day, McPhee fires Larry, but when they go into the museum, they find it is crowded due to last night's strange activities, and Larry is immediately rehired . During the credits, Larry, Nick, and the exhibits have a big party while Cecil, Gus, and Reginald are granted mercy by Larry, but ordered to serve community service for their crimes, by being museum janitors . </P>

Who is the bad guy in night at the museum
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