Able the Space Monkey is a supporting character in Night at the Museum: Battle of the Smithsonian and is portrayed by Crystal the monkey who also portrays Dexter. He is an exhibit at the Air and Space Museum.
On May 28, 1959, aboard the JUPITER AM-18, Able, a rhesus monkey, and Miss Baker, a squirrel monkey, became the first monkeys to successfully return to Earth after traveling in space. Able was born at the Ralph Mitchell Zoo in Independence, Kansas. They travelled in excess of 16,000 km/h, and withstood 38 g (373 m/s²). Able died June 1, 1959 while undergoing surgery to remove an infected medical electrode, from a reaction to the anesthesia. Baker died November 29, 1984 at the age of 27 and is buried on the grounds of the United States Space & Rocket Center in Huntsville, Alabama. Able was preserved, and is now on display at the Smithsonian Institution's National Air and Space Museum. Their names were taken from a phonetic alphabet.
Night at the Museum: Battle of the Smithsonian
Able is on display at the Air and Space Museum and meets Larry here. When trying to escape from some on Kahmunrahs men, Larry and Amelia Earhart climb aboard Old Bessie a plane and fly it towards the exit of the museum. Able helps Larry and Amelia exit the museum by opening a large rollerdoor.