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.

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.

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

A younger Batiatus finds himself newly in control of his father’s gladiator school. He uses his most skilled fighter to win favor with a cunning nobleman behind the building of the new arena.

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.

Spartacus and his group of rebels attempt to free those who became slaves by falling in foreign wars while Lucretia manages to recruit one of her husband's former gladiators.

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

Spartacus leads a daring assault to provide food and shelter for his people. Crassus builds a fearsome army and receives an unexpected visitor.

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.