Harvey, the arrogant and spoiled son of an indulgent absentee-father, falls overboard from a transatlantic steamship and is rescued by a fishing vessel on the Grand Banks. Harvey fails to persuade them to take him ashore, nor convince the crew of his wealth. The captain offers him a low-paid job, until they return to port, as part of the crew that turns him into a mature, considerate young man.
Erstwhile childhood friends, Judah Ben-Hur and Messala meet again as adults, this time with Roman officer Messala as conqueror and Judah as a wealthy, though conquered, Israelite. A slip of a brick during a Roman parade causes Judah to be sent off as a galley slave, his property confiscated and his mother and sister imprisoned. Years later, as a result of his determination to stay alive and his willingness to aid his Roman master, Judah returns to his homeland an exalted and wealthy Roman athlete. Unable to find his mother and sister, and believing them dead, he can think of nothing else than revenge against Messala.