It's post WWII and former archaeologist/tomb-raider Rick O'Connell (BRENDAN FRASER) and his wife, Evelyn (MARIA BELLO), have long given up digging up and dealing with mummies. But that hasn't prevented their adventurous 18-year-old son from following in his dad's footsteps.
Now on a dig in China, Alex (LUKE FORD) is working with Prof. Roger Wilson (DAVID CALDER) in hopes of finding long-entombed Emperor Han (JET LI) and his legendary terra-cotta army. Legend has it that Han once ruled the land but wanted to be immortal, and thus sent General Ming (RUSSELL WONG) to find a witch capable of delivering that for him. But when Ming ended up having an affair with Zi Juan (MICHELLE YEOH), Han killed his military commander and wounded Zi Juan, but not before she cast a spell on him and his army, turning all of them to stone.
But Alex and Roger aren't the only ones who want to find the long-buried emperor. Chinese Army General Yang (ANTHONY WONG CHAU-SANG), along with his assistant, Choi (JESSEY MENG), wants to resurrect Han to bring order to their chaotic world, and after Alex finds him, that plan is set into motion.
That ends up involving Rick and Evelyn, as well as her brother Jonathan Carnahan (JOHN HANNAH) who runs a nightclub in Shanghai, as well as longtime ally Mad Dog Maguire (LIAM CUNNINGHAM). With the aid of Zi Juan and her ninja daughter, Lin (ISABELLA LEONG), Rick and the others do what they can to prevent Han from resurrecting his army and thus ruling the world once more.