“Enemies of Rome” introduces us to fresh, fascinating characters and more cathartic bloodshed. We meet Marcus Crassus, a wealthy aristocrat who seems to be Rome’s last hope for funding a larger army. Crassus unexpectedly becomes a key player in the entire season, and the only man who seems to be a worthy match for Spartacus. Crassus proves more competent than both Batiatus and Glaber from the beginning; he understands the threat posed by Spartacus and doesn't take it lightly.