Spartacus continues to build a formidable army and outwit Romes best commanders. The powers of the Empire are forced to turn to wealthy, ambitious Marcus Crassus to aid the campaign.

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.

The possible infiltration of a Roman spy causes tension to mount between Spartacus and his men. Crassus resurrects a long abandoned form of Roman punishment to teach his soldiers a brutal lesson.

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

As Crassus leads an onslaught against the rebel-occupied city, Gannicus finds himself trapped behind enemy lines. Tiberius is tasked by Crassus to hold a celebration in honor of a man he despises.

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 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.

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.

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