Spartacus continues to assemble a formidable rebel army and to outwit the best of Romes commanders. The powers of the Empire are desperately forced to turn to wealthy, ambitious Marcus Crassus for his help with the campaign.
Spartacus attempts to launch a bold assault to obtain food and shelter for his followers, while Crassus raises a formidable army and welcomes the arrival of a surprise visitor.
Spartacus strikes a deal with a band of travelling marauders to ensure his people stay supplied and fed. Crassus' son Tiberius makes a bold and fateful decision regarding his future.
The possible infiltration of a Roman spy into the rebel camp, 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 following their cowardice in the recent battle.
Spartacus puts a plan in motion to weaken Crassus' forces and gain the upper hand on the battlefield,but a betrayal threatens to foil his plan.
When Crassus attacks the rebel-occupied city, Gannicus becomes trapped behind enemy lines. Meanwhile, Crassus orders his son Tiberius to arrange a celebration for a man he loathes.
With their forces trapped on an impassable, snowbound ridge, Spartacus and Crixus clash over a method of escape. Crassus findsit increasingly difficult to control the actions of those closest to him.
Spartacus and the group of rebels come to a crossroads in their quest for freedom, while a relentless Crassus doggedly drives his men in the pursuit of Spartacus and his forces, while the conflict between Tiberius and Caesar intensifies.
Crassus discovers another Roman is apparently trying to take 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.