In the prequel Spartacus: Gods of the Arena, Brandt played body slave Naevia to Lucretia (Lucy Lawless) and then eventually became the lover of Crixus the gladiator in the original series' first season. Brandt decided not to renew her contract to appear in the second season, so producers recast her character with Addai-Robinson, who has appeared on FlashForward, CSI: NY, and Chuck.
The news was first reported by Entertainment Weekly.
This is the second actor from the series who has been replaced. Star Andy Whitfield had to drop out of Spartacus to battle non-Hodgkin's lymphoma, and Liam McIntyre stepped into his sandals for the second season.
Spartacus Season 2 will premiere in 2012.