Cast
Ben Stiller as Larry Daley, a security guard at the American Museum of Natural History.
Stiller as Laaa, a Neanderthal who was made to resemble Larry.
Rami Malek as Ahkmenrah, the mummy of an ancient pharaoh.
Dan Stevens as Sir Lancelot, the wax statue of the legendary Knight of the Round Table.
Robin Williams as Theodore Roosevelt, the wax sculpture of the 26th President of the United States who is Larry's mentor.
Williams also voices Garuda.
Owen Wilson as Jedediah, a cowboy diorama miniature and Octavius' best friend.
Steve Coogan as Octavius, a Roman soldier miniature and Jedediah's best friend.
Rebel Wilson as Tilly, the night security guard at the British Museum.
Skyler Gisondo as Nick Daley, the son of Larry Daley who is now a teenager.
Ben Kingsley as Merenkahre, the mummy of an ancient pharaoh and Ahkmenrah's father.
Ricky Gervais as Dr. Leslie McPhee, the director of the Museum of Natural History and Larry's boss.
Mizuo Peck as Sacagawea, the polyurethane model of the Lemhi Shoshone woman who is Theodore Roosevelt's girlfriend.
Patrick Gallagher as Attila the Hun, the statue of the leader of the Huns.
Crystal the Monkey as Dexter, a stuffed Capuchin monkey.
Anjali Jay as Shepseheret, the mummy of a Great Royal Wife of Merenkahre and Ahkmenrah's mother.
Brad Garrett (voice) as Moai, an Easter Island Head at the Museum of Natural History.
Randy Lee, Darryl Quon, Gerald Wong, Paul Chih-Ping Cheng as wax models of Huns.
Kerry van der Griend, Matthew Harrison, and Jody Racicot as wax models of Neanderthals.
Matty Finochio as Roman Sentry.
Rachael Harris as Madeline Phelps, the chairwoman of the American Museum of Natural History.
Dick Van Dyke as Cecil Fredericks Jr., a retired security guard from the first film.
Percy Hynes White plays the younger Cecil "C.J" Fredericks Jr. in the prologue.
Mickey Rooney as Gus, a retired security guard from the first film.
Bill Cobbs as Reginald, a retired security guard from the first film.
Andrea Martin as Rose, an archivist at the Museum of Natural History.
Brennan Elliott as Robert Fredericks, C.J.'s father in the prologue.
Matt Frewer as Archibald Stanley, an archaeologist who accompanies Robert and Cecil in the prologue
Hugh Jackman (uncredited) as himself
Alice Eve (uncredited) as herself
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