The rebellion Spartacus has created has turned into thousands, now with Crixus and Gannicus they begin to take on Rome. Unknowingly to them, Rome has enlisted the help of Marcus Crassus, and a young Julius Caesar.

Spartacus launches a bold assault to procure food and shelter for his followers, while Crassus raises a formidable army and welcomes a surprise visitor.

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

Tension rises to new levels between Spartacus and his men after the possible infiltration of a Roman spy. Crassus resorts to a long forgotten form of Roman punishment to teach his soldiers a bloody lesson.

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

Crassus attacks the rebel-occupied city, while Gannicus is trapped behind enemy lines. Meanwhile, Crassus orders Tiberius to arrange a celebration for a man he loathes.

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 come to a crossroads in their quest, while a relentless Crassus doggedly drives his men in the pursuit of Spartacus and his forces, and the conflict between Tiberius and Caesar intensifies.

Crassus discovers a not-so-noble Roman is taking credit for crushing the rebel forces, while Spartacus attempts to secure a bargaining chip to use against his conquerors.

Spartacus and his army of outnumbered rebels make one last attempt to win their freedom in a final battle against the advancing Romans led by Marcus Crassus.