In ancient China, a group of European mercenaries encounters a secret army that maintains and defends the Great Wall of China against a horde of monstrous creatures.

With global superpowers engaged in an increasingly hostile arms race, Superman leads a crusade to rid the world of nuclear weapons. But Lex Luthor, recently sprung from jail, is declaring war on the Man of Steel and his quest to save the planet. Using a strand of Superman's hair, Luthor synthesizes a powerful ally known as Nuclear Man and ignites an epic battle spanning Earth and space.

When a mercenary warrior (Matt Damon) is imprisoned within the Great Wall, he discovers the mystery behind one of the greatest wonders of the world. As wave after wave of marauding beasts besiege the massive structure, his quest for fortune turns into a journey toward heroism as he joins a huge army of elite warriors to confront the unimaginable and seemingly unstoppable force.