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 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.

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.

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.

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

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

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.

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

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.

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