<Li> Ricky Gervais as Dr. McPhee, the director of the Museum of Natural History . </Li> <Li> Rachael Harris as Madeline Phelps, the chairwoman of the American Museum of Natural History . </Li> <Li> Dan Stevens as Sir Lancelot, the wax statue of the legendary Knight of the Round Table . </Li> <Li> Rebel Wilson as Tilly, the night security guard at the British Museum . </Li>

Who plays sir lancelot in night at the museum