According to some sources, Spartacus wanted to flee to Sicily with hundreds of his men and start a rebelion there, but was betrayed by the pirates who had agreed to cross them.
What if they had managed to cross? Sicily was full of unhappy slaves working in plantations and in the mines, and had a history of slave rebelions.
Could spartacus' arrival had sparked a general rebellion? If so, what's the best case scenario for them? How much can they achieve? And what would the effects of this be in Roman politics?