Mounted and directed by the legendary showman Cecil B. DeMille and photographed by the marvelously adroit cinematographer Karl Struss (Sunrise, Island of Lost Souls), The Sign of the Cross is a dispiriting epic that purports to tell the tale of Roman persecution of Christians under the reign of Nero, who is believed under some theories to have ordered his men to set fire to the city and then blamed local Christians for the damaging blaze. But despite insistently dull depictions of the monotonous lives of the true believers, who are so dumb they can’t even station proper lookouts outside their secret prayer meetings, what DeMille’s really into is the hedonistic habits of the Roman upper classes. The result is a film whose generous helpings of sex and violence are overwhelmed by its general air of condescension and phony piety.