Antony, Octavius, and Lepidus decide who must be executed to protect their new power in Rome. Antony and Octavius begin to plan a campaign against Brutus and Cassius, who have raised an army. Brutus then proposes marching on Phillipi, where their enemies have camped. Cassius argues that they should stay where they are and let Antony and Octavius use up their energy marching, but Brutus insists that his plan is superior and Cassius gives in.  The Ghost of Caesar appears to Brutus!