The episode begins with Gannicus killing Romans and destroying their homes, while yelling “I am Spartacus”. A montage is shown of other members of Spartacus’s army, including Spartacus himself, making the same declaration. The point is to confuse the Romans about the rebel leader’s true whereabouts. Crassus talks about this with Caesar, and they figure that there is strategy at work. Crassus, knowing that Pompey wants to steal his glory, looks to engage Spartacus at the earliest opportunity. Spartacus and Gannicus plan to fight the Romans in order to give the others a chance to escape.
Agron wants to join them in the final stand, but he is in a bad shape and can’t even grip a sword. On seeing his condition, Nasir fashions a half-sword/half-shield weapon that will allow him to fight. After Gannicus and Sibyl are done having sex, she says that she wants him to come with her to the mountains. He refuses, saying he has to stay and fight. Before heading for battle, Crassus, who is still mourning his son, asks Kore about the slave who took Tiberius’ life. She again lies, saying that it was a male assassin. At the rebel camp, Laeta tells Spartacus that, no matter what he says, she plans to wait for him at the foot of the mountain.
Afterwards, Agron tells Spartacus that, instead of escaping with the others, he plans to fight alongside him. Spartacus gives a speech to the members of his forces, who are fleeing to the mountains. He tells them he plans to make a final stand against the Romans, to win them enough time to escape. Word comes that Crassus has arrived, so Spartacus gives Laeta a kiss goodbye before she leaves with the others. After seeing Sibyl off, Gannicus tells Spartacus that he had his fill of tearful goodbyes and now wants to shed the enemy’s blood. Spartacus agrees with him and proceeds with his men to prepare for the imminent battle.
While they are at it, Crassus sends a messenger asking Spartacus for a meeting. Spartacus, Naevia, Nasir, Gannicus, and Agron go to confront Crassus, Caesar, and the Romans. Crassus and Spartacus leave the others for a face to face. During their conversation, Spartacus lets slip that a female slave killed Tiberius. The two men also compare personal losses; Crassus has lost a son, and Spartacus, a wife. They both concur that there is no justice in this world and are glad to learn that they at least agree on something. After returning, Crassus angrily confronts Caesar about Spartacus’ story that a woman, not a man as he was told, killed his son.
Kore enters the tent and, even as Caesar tries to stop her, she confesses. Crassus pulls a knife to end her life, but Caesar stops him by telling Crassus that Tiberius raped her. After sending Caesar away, Crassus, who is shocked with the revelation, apologizes to Kore for all she has suffered and tells her it will all end when Spartacus is defeated. At the rebel camp, Gannicus and Spartacus talk about the impending battle. Spartacus also confesses that, although he has found some comfort in the arms of another woman, he has never gotten over his slain wife, Sura. He says death is not what defines victory for him now, but instead life does, and he sees his deceased wife in each person that he helps escape.
He tells Gannicus that he must assume a leadership role if they are to give their men any chance against Crassus. Gannicus asks Spartacus what he expects of him, and Spartacus only replies by saying that he is expecting the impossible. It’s time for battle, so Spartacus prepares to give his troops a final speech. He turns to his followers and says their fight is against those who would force others into slavery, so that people with wealth and influence can see their fortunes grow beyond need or purpose. He adds that all men were created equal and it is time they took down those who seek to trample the idea of freedom. Crassus, too, is giving his men a speech and preparing them for battle.
After he has urged his men to annihilate the enemy, the Romans advance. On the other end, so do Spartacus and his men. Spartacus tells his troops to take position, while the Romans keep coming and fall into a hidden trench, lined with spikes. Spartacus and his forces lay planks across the trench and cross while, in an effort to kill the rebels, Crassus catapults fireballs into his own men. From the rear, Gannicus mounts an unexpected charge, aided by Saxa, while Caesar slays Castus with a single sword stroke across his chest. Nasir comes to his aid, but it’s too late. Crassus and Spartacus confront each other on the field; Crassus is knocked from his horse and is dragged away to safety by his men. Spartacus goes after him, killing the men around him.
During battle, Saxa is badly injured and Gannicus holds her as she falls. After she passes away in his arms, Gannicus roars and returns to the fight. Naevia is killed by Caesar before his eyes and, soon after, Gannicus is overcome by a circle of shielded soldiers. With visions of the capture of his wife running through his head, Spartacus beats Crassus in single combat before being stabbed by spears from behind by Roman soldiers. Agron and Nasir arrive just in time to save Spartacus, while Crassus makes his way to safety. Spartacus is taken away by some of his men, but the Romans clearly have the upper hand.
Gannicus is nailed to the cross, along with other captured rebels. He imagines that he is back in the arena, enjoying yet another victory. He dies soon after and Kore, with a tear rolling down her cheek, is crucified nearby. Pompey, who has swept up some of Spartacus’ forces near the mountains, arrives. After all the bloodshed, Pompey claims the triumph. Crassus doesn’t argue because he’s already plotting on forming a political alliance with Pompey and Caesar. Spartacus is taken to the group of rebels, who are fleeing, and are at the foot of the mountains. Pompey has killed some of the refugees, but a few managed to escape, including Agron, Laeta, Nasir, and Sibyl.
Spartacus, who is dying of his wounds, thinks about the greeting he will get from his wife in the afterlife. He orders the rebels to not shed a tear, saying there isn’t a greater glory than dying a free man. He passes away soon after and the surviving rebels: women, children and former warriors make their way to freedom. The very last shot shows a grave marked only by Agron’s shield.
During the end credits, a haunting piece of music plays over a montage of past and present show stars, ending with a fitting tribute to season one Spartacus Andy Whitfield, as he delivers the famous line "I Am Spartacus".