Attracted by the Hellmouth, a centre of mystical convergence, vampires, zombies, werewolves, incubi, succubi and everything you've ever dreaded was under your bed but told yourself couldn't be by the light of day, gravitate towards Sunnydale. Despite the slayers best efforts, the things that go bump in the night, make a re-appearance in the future. Here's a list of them all in episode order. You can also find them listed by alphabetically and in order of appearance on each show/comic at the Demon Database home page.