Set in 15th century China, The Great Wall stars Matt Damon as William Garin, a European mercenary traveling to China in search of gunpowder. Along with his companion Pero Tovar (Pedro Pascal), William stumbles upon the legendary Great Wall of China – but not as a mere defensive structure against human invaders. Instead, he discovers that the wall serves as a barrier against terrifying mythical creatures called Taotie – monstrous lizard-like beasts that emerge every 60 years to feed on humanity.