(Now there is a werewolf in the story)
Include a werewolf or many now or before the next round.
(Now there is a vampire in the story)
Include a vampire or many now or before the next round.
(Now there are aliens in the story)
Include an alien or many or a UFO sighting or abduction now or before the next round.
(Now there is a ghost in the story)
Include a ghost or many now or before the next round.
(Now there is a mummy in the story)
Include a mummy or many now or before the next round.
(Now there are zombies in the story)
Include a zombie or many now or before the next round.