Bob Naughton and Eddie Connolly are identical-twin brothers that were separated in infancy. Bob is raised by a rich lawyer, has all the advantages, but is a drunk with no moral character. Eddie is a pianist in a speak-easy but a man of high character. Bob commits a murder and Eddie is blamed and faces life in prison.
A girl travelling by train to meet her boyfriend meets another young man and falls in love with him.
The story of an idle rich boy who joins the US Army's Rainbow Division and is sent to France to fight in World War I, becomes friends with two working class men, experiences the horrors of trench warfare, and finds love with a French girl.
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.