Milo (Kit Harington) is the only survivor after Roman soldiers massacre everyone in his village of horsemen. In Pompeii, he eventually grows up to be a champion gladiator who leaves a pile of corpses in his wake whenever he sets foot in the arena. Cassia (Emily Browning), the daughter of a nobleman, falls for Milo, but their dangerous romance means he has incurred the wrath of a Roman senator (Kiefer Sutherland) besotted with Cassia. As Mt. Vesuvius erupts, the couple must find a way to escape him and their doomed city.