In the season finale, Spartacus enlists the help of an accomplice in order to get his revenge.

Spartacus and his outnumbered rebels make one last attempt to win freedom in an epic final battle against the Romans.

Spartacus puts a plan in motion to weaken Crassus's forces and gain the upper hand. Betrayal threatens to foil the plan.

Spartacus and his rebels train hard to keep their new sanctuary safe while Glaber's forces are made stronger with the enlistment of some new deadly recruits. Lucretia and Ilithyia become close again.

Numerius is honored with an exhibition match for his birthday celebration at the ludus. Ilithyia gives Numerius a surprising gift, but asks for something in return.

Lucretia and Batiatus await the arrival of Glaber with the intentions to receive his patronage, while Spartacus focuses his attention on his plan for revenge.

Batiatus is presented with a gladiatorial opportunity of a lifetime. Spartacus and Crixus must overcome their mutual hostility to fight as a team against a legendary and unbeaten opponent.

Spartacus realizes that becoming the leader of a mass of freed slaves can be challenging and he struggles to keep the rebellious group intact when news of Claudius Glaber's arrival in Capua reaches him.

Crassus learns that a fellow prominent Roman is attempting to steal the glory of defeating Spartacus. Spartacus aims to secure a bargaining chip he can use against the Romans.

Batiatus breaks the news that Spartacus is to service the richest woman in Rome.

When a shortage in supplies has the rebellion about to fail, Spartacus tries his best to give his men hope.

Spartacus hovers on the brink. Meanwhile, Batiatus plots revenge against his enemies

Lies, distrust and duplicity plague the house of Batiatus and impact the hopes of both Barca and Spartacus, who have benefited from good fortune and envision a future away from the grounds. Barca expects to buy his and his male lover's way out, while Spartacus anticipates his promised reunion with his enslaved wife, part of his reward for a monumental victory in the arena. But just in case things go wrong, Spartacus dreams and schemes an escape plan.

In an ironic twist of fate, a gladiator from the house of Batiatus will stand in the way of Spartacus trying to free Crixus from Roman captivity. Ilithyia's scheming puts her marriage to Glaber at risk.

Their forces trapped on an impassable, snowbound ridge, Spartacus and Crixus clash over the method of escape. Crassus discovers it increasingly difficult to control the actions of those closest to him.

Spartacus and his men liberate a Roman villa, but its slaves are wary. Oenomaus throws himself into the brutal Pits, and Glaber supports Lucretia’s prophecies, despite Ilithyia’s protests.

Having performed shamefully in the arena against Crixus, Spartacus is forced to fight in the Pits. Batiatus, determined to profit from Spartacus, may be at risk if his debts aren't repaid.

Batiatus purchases a fresh batch of slaves during an auction to be trained as gladiators and ponders the idea of selling Crixus.

Spartacus and the rebels arrive at a crossroads. With the relentless Crassus driving his men hard in the pursuit of Spartacus, the conflict between Tiberius and Caeser escalates.

Overcome by the pressure of Batiatus's control, Spartacus must make a choice: leave his past behind and assume the mantle of a champion gladiator, or die.

Spartacus considers striking a deal with a band of marauders to ensure his people stay supplied and fed. Crassus's son Tiberius makes a bold and fateful decision.

Though Spartacus proved himself during training and now wears the attire of a gladiator, his coarse attitude and relentless quest to see his wife isolates him from his fellow gladiators and Doctore.

Spartacus is forced to mediate when the gladiators are close to divide into groups after news of Naevia's fate reaches them. Lucretia exchanges a long-held secret for some information and an attack puts the rebels at risk.

Spartacus seeks the safety of the woods for his surviving men while Crixus finds himself revisiting past horrors. Meanwhile, Lucretia spies Ilithyia's affairs.

Spartacus has to once again use his leadership skills to convince his band of rebels to unite against the Roman assault. Lucretia struggles to get rid of those men standing in the way of her fate.