1. Marellus and Flavius confront a group of plebians who are celebrating Julius Caesar's victory over Pompey. The two senators take down the decorations from Caesar's statues and break up crowds of plebians to diminish Caesar's popular support.
2. Caesar instructs Antony to whip his wife, Calpurnia, during the ceremonial race through the city so she'll be able to have a child. A soothsayer warns Caesar to "beware the ides of March."
3. Cassius and Brutus speak together. Cassius praises Brutus and reminds him that he is widely respected. Brutus hears cheering and says that he fears that the people will choose Caesar as their king. Cassius uses this opportunity to describe Caesar as weak.
4. Casca recounts to Brutus and Cassius how Caesar refused the crown three times (more reluctantly each time). Brutus says that he will consider joining the conspiracy.
5. Caesar's group returns. Caesar realizes that Cassius is up to something and warns Mark Antony of his "lean and hungry look."
6. It is storming in Rome, which many characters interpret differently. Casca joins the conspiracy. Cassius reveals that he intends to plant letters at Brutus' house to convince him to join the conspiracy.