Kahmunrah

Kahmunrah is the main antagonist of Night at the Museum: Battle of the Smithsonian. Kahmunrah is the older brother of Ahkmenrah and the first born son of Merenkahre and Shepseheret. He wishes to get his brother's tablet so that he can revive the underworld. Kahmunrah is portrayed by Hank Azaria.

Night at the Museum: Battle of the Smithsonian
He rules the Earth and the Smithsonian museum with an iron fist, and then joins forces with other historical leaders such as Ivan the Terrible, Napoleon Bonaparte and Al Capone. Later, modern screen villians, which include Oscar the Grouch (from Sesame Street) and Darth Vader (from the Star Wars films), also want to be on Kahmunrah's team, but the Egyptian king does not let them (Oscar the Grouch is not evil at all and Darth Vader does not speak but tries to use the Force, which naturally does not work and Kahmunrah does not understand the hand motion). Kahmunrah discovers the combination on the tablet has been changed, and coerces Larry Daley into finding out the new combination by trapping his cowboy friend Jedediah in an hourglass. He later learns the combination after Al Capone interrogates a bobble-headed Albert Einstein (it's pi), and uses it to open to the gate to the underworld, unleashing an army of falcon-headed warriors. These are sent back to the underworld by the giant statue of Abraham Lincoln, and Kahmunrah is later banished to the underworld by Larry Daley and he is never seen or heard from again.

Trivia

 * In an early version of the script for Battle of the Smithsonian, during a conversation with Larry Kahmunrah reveals that he murdered his younger brother, Ahkmenrah.