<P> Three years later, Larry now works as a teacher, and a travelling British Museum exhibit comes to New York . Tilly becomes the new night guard, and gives the tablet to Dr. McPhee, showing him its power, and allowing the exhibits to awaken again . Outside, Larry watches them party inside . </P> <Ul> <Li> Ben Stiller as Larry Daley, a security guard at the American Museum of Natural History . <Ul> <Li> Stiller also plays Laaa, a Neanderthal who resembles Larry . </Li> </Ul> </Li> <Li> Robin Williams as Theodore Roosevelt, the wax statue of the 26th President of the United States . </Li> <Li> Owen Wilson as Jedediah, a cowboy diorama miniature . </Li> <Li> Steve Coogan as Octavius, a Roman soldier miniature . </Li> <Li> Ricky Gervais as Dr. McPhee, the director of the Museum of Natural History . </Li> <Li> Rachael Harris as Madeline Phelps, the chairwoman of the American Museum of Natural History . </Li> <Li> Dan Stevens as Sir Lancelot, the wax statue of the legendary Knight of the Round Table . </Li> <Li> Rebel Wilson as Tilly, the night security guard at the British Museum . </Li> <Li> Skyler Gisondo as Nick Daley, the son of Larry Daley . He was previously played by Jake Cherry in the first two films . </Li> <Li> Rami Malek as Ahkmenrah, the mummy of an ancient pharaoh . </Li> <Li> Patrick Gallagher as Attila the Hun, the statue of the leader of the Huns . </Li> <Li> Mizuo Peck as Sacagawea, the polyurethane model of the Lemhi Shoshone woman who is Theodore Roosevelt's girlfriend . </Li> <Li> Ben Kingsley as Merenkahre, the mummy of an ancient pharaoh and Ahkmenrah's father . </Li> <Li> Dick Van Dyke as Cecil "C.J." Fredericks, a retired security guard from the first film . <Ul> <Li> Percy Hynes White plays the younger Cecil "C.J." Fredericks </Li> </Ul> </Li> <Li> Mickey Rooney as Gus, a retired security guard from the first film . </Li> <Li> Bill Cobbs as Reginald, a retired security guard from the first film . </Li> <Li> Andrea Martin as Rose, an archivist at the Museum of Natural History . </Li> <Li> Brennan Elliott as Robert Fredericks, C.J.'s father in the prologue . </Li> <Li> Matt Frewer as Archibald Stanley, an archeologist who accompanies Robert and Cecil in the prologue . </Li> <Li> Anjali Jay as Shepseheret, the mummy of a Great Royal Wife of Merenkahre and mother of Ahkmenrah . </Li> <Li> Crystal the Monkey as Dexter, a Capuchin monkey . </Li> <Li> Hugh Jackman as Himself (uncredited) </Li> <Li> Alice Eve as Herself (uncredited) </Li> </Ul> <Li> Ben Stiller as Larry Daley, a security guard at the American Museum of Natural History . <Ul> <Li> Stiller also plays Laaa, a Neanderthal who resembles Larry . </Li> </Ul> </Li> <Ul> <Li> Stiller also plays Laaa, a Neanderthal who resembles Larry . </Li> </Ul>

Does ben stiller play two characters in night at the museum