Brutus and Cassius see their military advantage vanish in the wake of Octavian's new alliance with Mark Antony. In Rome, Vorenus receives orders to prune the ranks of Rome's elite. With the future of Rome at stake, the two armies clash on the plains of Philippi.
Octavian, Mark Antony and Lepidus agree to divvy up Rome's territories. Eirene insists Pullo punish Gaia for insubordination but the slave turns the flogging to her advantage. Levi urges Timon to help him kill Herod, who has arrived from Judea with a secret agenda.
Octavian's campaign for a more virtuous society hits hardest in his inner circle. Vorenus' efforts to discover who hijacked the gold en route to the Roman treasury leave a bitter taste of betrayal. Pullo turns his grief about a personal loss into anger at a new enemy.
Vorenus returns to the Collegium with his rescued daughters and son Lucius. Denied a triumph in Rome, Octavian urges Cicero to embrace his request to be made consul. To gain advantage over Brutus and Cassius' army, two adversaries patch up their differences.