According to The Hollywood Reporter, Robin Williams has signed on to play Theodore Roosevelt in the Ben Stiller starrer Night at the Museum for 20th Century Fox.

Helmed by Shawn Levy, the big-budget, live-action/CG comedy centers on a night watchman (Stiller) at a museum of natural history who discovers that its many exhibits awaken at night under the spell of a pharaoh's tablet. The exhibit of President Roosevelt, who founded the American Museum of Natural History in New York, is one of those that comes to life. Carla Gugino, Kim Raver, Mickey Rooney, Dick Van Dyke and Bill Cobbs already have joined the cast.