Adventure drama set prior to the eruption of Mount Vesuvius that buried the city of Pompeii. Hardened by the recent death of his wife and baby, Marcus (Preston Foster) becomes a gladiator and soon grows wealthy. Following one of his matches, Marcus realises he has killed the father of the young Flavius (David Holt) and decides to bring up the child as his own. When Flavius gets injured in a riding accident, Marcus takes him to Jesus Christ, who heals the boy. Marcus, however, remains skeptical about religion. Years later, Flavius (now played by John Wood) is arrested for assisting slaves and while he is trapped in jail, Mount Vesuvius erupts. Marcus must now ask for mercy for his son but will his prayers be too late to save him?