Joseph Mankiewicz's film version of Julius Caesar, which details the conspiracy to betray the great ruler and the fallout from his assassination, is generally heralded as one the great Shakespearean screen adaptations. I found the film to be not opened up entirely well for the medium and only coming to life with Marlon Brando's second act entrance playing Mark Antony. John Gielgud is also extremely strong as Cassius and James Mason is a surprisingly ineffective Brutus.