Spike has encountered The First before. In the good old days in Victorian London, when Spike, Drusilla, Angelus, and Darla ran through the night in pursuit of dark fun, another evil being was stalking the streets, dispatching young women with brutal efficiency. But when the so-called "Jack the Ripper" struck too close to their twisted "family," the vampires found themselves on the same side as the Slayer of that time. Working to bring down Jack, and running afoul of The First, Spike and the Slayer formed an uneasy alliance, which followed Spike all through the twentieth century to present day Sunnydale, now blanketed in a mysterious fog....
eBook Blood and Fog (Buffy the Vampire Slayer: Season 7-8, #6)