On the run from the authorities, Augustus flees his place of refuge as it is about to be destroyed. Now in need of fuel, he heads to Earth with his only son, only to be pursued by his old nemesis, Titus. Augustus expects to find the Roman Empire when he gets there, only to discover things have moved on and the Romans aren't around anymore. Augustus finds Earth is on the brink of being assimilated, and if successful, humanity will be enslaved forever...