Special Guest appearance

He's Ivan the Terrible in Fox's 'Museum' sequel

Christopher Guest is taking it up to 11 for Fox's sequel to "Night at the Museum."

The "Spinal Tap" star has joined the cast as Ivan the Terrible for the comedy adventure, officially titled "Night at the Museum: Battle of the Smithsonian."

Also joining the cast are Jon Bernthal (Al Capone), Bill Hader (Gen. George Armstrong Custer) and French actor Alain Chabat (Napoleon).

The film, directed by Shawn Levy, reunites lead Ben Stiller with castmates Robin Williams, Ricky Gervais and Owen Wilson.

Robert Ben Garant and Thomas Lennon, who penned both "Museum" films, will make a cameo in the sequel, playing the Wright brothers.

"Museum" was a boxoffice success for Fox, grossing $574 million worldwide. With the Smithsonian as the centerpiece, the studio and Levy kicked the current production up a notch by getting the rare chance to film portions of the movie in the Smithsonian Institute in Washington.

The film is shooting in Vancouver, with a behind-the-scenes team that includes director of photography John Schwartzman ("Pearl Harbor"), editors Don Zimmerman and Dean Zimmerman ("Rush Hour 3"), production designer Claude Pare ("The Aviator") and costume designer Marlene Stewart ("Tropic Thunder"). (partialdiff)