Nick Daley’s summer gig as night watchman at the museum is a challenging job for a high school student, but he is following in his father’s footsteps and is determined not to let him down. Luckily, he is familiar with the museum’s ancient tablet that brings everything to life when the sun goes down and is happy to see his old friends, including Jedediah, Octavius, and Sacagawea, when he arrives. But when the maniacal ruler Kahmunrah escapes with plans to unlock the Egyptian underworld and free its Army of the Dead, it is up to Nick to stop the demented overlord and save the museum once and for all.