Andy Whitfield as Spartacus – a Thracian slave who becomes a gladiator in the ludus of Lentulus Batiatus.
Erin Cummings as Sura – the wife of Spartacus.
John Hannah as Quintus Lentulus Batiatus – a lanista and Spartacus' master.
Lucy Lawless as Lucretia – Batiatus' wife.
Manu Bennett as Crixus – a Gaul, he is Batiatus' top gladiator. Love interest of Naevia.
Peter Mensah as Doctore/Oenomaus – Batiatus' trainer of gladiators.
Jai Courtney as Varro – a Roman citizen who sold himself to the ludus to support his family.
Nick E. Tarabay as Ashur – a Syrian former gladiator whose leg was crippled in the arena by Crixus; now serves Batiatus as a bookkeeper and henchman.
Dan Feuerriegel as Agron - a gladiator recruit who helps Spartacus plot his revenge.
Antonio Te Maioha as Barca – nicknamed the "Beast of Carthage", he is one of Batiatus' most successful gladiators, serves as a bodyguard for his master.
Craig Walsh Wrightson as Solonius – a rival lanista to the House of Batiatus.
Lesley-Ann Brandt as Naevia – Lucretia's personal and loyal slave. Love interest of Crixus.
Viva Bianca as Ilithyia – the daughter of senator Albinius and wife of Glaber.
Katrina Law as Mira – a slave girl sent under threat of death to seduce Spartacus and become his lover.
Craig Parker as Gaius Claudius Glaber – a Roman army legatus who is responsible for Spartacus' enslavement as a gladiator.

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