That morning, we open on a shot of a spinning globe and Giles pontificating about demon history. Apparently, demons ruled the Earth long ago but eventually lost their hold on this world. Now, mortal creatures rule the Earth and only a few demons remain. One fly in the ointment: Giles explains that the last demon to leave our reality fed off a human, mixing their blood and creating the first vampire. Repeat ad infinitum. Xander wants to know how to kill vampires, but Buffy insists that any killing be left up to her.