The Story
In ancient Rome, the general Julius Caesar has just defeated the general Pompey in a bloody civil war. The people celebrate Caesar's victory and the Tribunes scold them for their disloyalty to Pompey. The people have placed crowns and other trophies on Caesar's statue. The Tribunes decide to take them off. 

Caesar enters, followed by his wife Calphurnia, and several senators, including his friend, Marc Antony. They are on their way to the celebration of Lupercal, a Roman festival. He is stopped in his path by a soothsayer, a person who can tell the future, and told "beware the Ides of March" The Ides of March was the middle of the month, or March 15th, which is just around the corner. They continue on their way to the festivities. Brutus and Cassius remain behind.

Cassius talks to Brutus about how powerful Caesar has become, and implies that he is undeserving. The conversation is punctuated several times by cheers from the nearby celebration. Caesar returns with his entourage, in a state of disorder and unease. He sees Cassius and Brutus, and speaks to Antony about his distrust of Cassius, saying "Yond Cassius has a lean and hungry look".

They leave, continuing their conversation.
Brutus and Cassius detain Casca, a senator who was with Caesar, and ask him why the crowd was shouting. Casca explains that Antony offered Caesar a crown three times, which Caesar refused each time. Casca believes Caesar really wanted it. Because of their concern that Caesar wants to be a King, the three senators plan to meet later.
After Brutus and Casca leave, Cassius reveals his plan to send Brutus anonymous messages, which express the danger. Caesar's increasing power poses to the Republic. That evening there is a terrifying, magnificent storm and Casca is thrilled at the portents of greatness. Cassius and another senator, Cinna, arrive, and the 3 of them plan to meet at Brutus' house to convince him to join their conspiracy.

Later that night (the night before the ides of March) Brutus reads the anonymous notes sent by Cassius and says, " Th'abuse of greatness is when it disjoins remorse from power." Cassius and the others arrive, and Brutus shakes hands with all of them, joining their conspiracy. They discuss the possibility of killing Antony as well as Caesar, but Brutus convinces them that Antony is harmless, and that he should live. They leave, with an agreement to show themselves "true Romans".

Brutus' wife, Portia enters and confronts Brutus about his recent behavior. She asks him to tell her what's troubling him. She believes a husband should confide in his wife and has wounded her own leg, to prove that she can stoically bear pain, as well as keep his secrets. He agrees to tell her later.

The next morning at Caesar's house, Calphurnia demands that Caesar stay at home. She's had nightmares about Caesar's murder so he agrees to stay home, and instructs Decius (a conspirator) to tell the Senate. Decius hints that Caesar would be laughed at if he chooses to stay at home because of his wife's dreams.

Caesar decides to go, calling Calphurnia's fears foolish. When he arrives at the Capitol, several conspirators gather around him, pretending to beg him to change his mind about a decision he's made. As the conspirators crowd around Caesar, he refuses them and insults them. Crying "Speak hands for me!" Casca stabs Caesar, the rest of the senators follow suit. Brutus, the last one, strikes as Caesar says "Et tu, Brute?" ("And you Brutus?") Brutus tells the conspirators to bathe their hands in Caesar's blood, and proclaim Rome's freedom from tyranny. 

Antony mourns the death of Caesar, but does not confront the assassins. He asks to speak at Caesar's funeral. Brutus agrees, over Cassius' objections.

Alone with Caesar's body, Antony praises his friend and curses his murderers. 
He prophesies death, destruction and horror for Rome, and imagines that Caesar's spirit, seeking revenge, will unleash the "dogs of war". A servant arrives, to tell Antony that Caesar's nephew Octavius has arrived in Rome. Out in the streets, the citizens demand an explanation for Caesar's death. Brutus tells them that Caesar died because of his ambition, and appeals to their sense of patriotism as free Romans. The crowd cheers Brutus. Brutus asks them to stay and listen to Antony. 

In his speech, Antony praises Caesar, and calls Brutus and his fellow conspirators honorable men. Then he questions Brutus assessment of Caesar's ambition. He speaks about his love for Caesar, and moves the crowd to pity. He shows the crowd Caesar's bloody, torn cloak, and describes his death. The people demand revenge and begin to riot. As the crowd storms away, Antony says, "Now let it work. Mischief, thou art afoot". We find out that Brutus and Cassius have been forced to flee Rome.

The armies of Brutus and Cassius meet outside of Rome. Cassius and Brutus have a passionate argument, with accusations flying between them, until Cassius offers to kill himself. When they finally reconcile, Brutus tells Cassius that Portia is dead, having killed herself by swallowing fire. They learn that Antony and Octavius, with their armies, are approaching, having put 100 senators to death.

The night before the battle, Caesar's ghost appears to Brutus in his tent.
The next morning, the generals meet and exchange accusations and insults.
Right before the battle begins, Brutus and Cassius talk about what will happen if they lose. 
They say goodbye, in case they never see each other again. The battle begins.

Cassius, mistakenly believing that all is lost, orders a soldier to stab him. He dies, saying, "Caesar, thou art revenged, even with the sword that killed thee" Titinius and Brutus arrive to tell Cassius of their victory, and discover he is dead.
The battle continues, and Brutus starts to lose. As the enemy approaches, the soldiers flee, urging Brutus to follow. He refuses, and convinces a soldier to hold his sword, while he runs on it, killing himself. Octavius and Antony arrive and see Brutus' dead body. Antony speaks respectfully of Brutus, while Octavius takes charge and celebrates.