In the first episode of Buffy’s seventh season, titled “Lessons,” Spike is going mad in the basement of the newly-rebuilt Sunnydale High when he gets a lecture from the season’s still-ruminating Big Bad. To deliver the speech, The First inhabits each of Buffy’s central nemeses from the previous seasons — Warren Mears, Glorificius, Adam — all the way down to the first season’s ur-villain, The Master, before eventually adopting the form of the Sla…