Larry Daley has left his job as a night guard at the Museum of Natural History, and is now a rich businessman. Then he hears his old friends - Teddy Roosevelt and the other exhibits - are moving to the Smithsonian Museum in Washington. And when the Tablet of Ahkmenrah brings all the exhibits in the Smithsonian to life, the trouble really starts... Can Larry and his friends win the Battle of the Smithsonian?