Mythicals! They’re real!
Fairies, pixies, trolls, werewolves, ogres, goblins . . .
They’re aliens, living in disguise among the "natives"!
. . . vampires, leprechauns, mermaids . . .
For thousands of years this planet has been a penal colony for their races.
. . . demons, angels, elves, gnomes, Sasquatch . . .
But now, they’ve decided the planet's inhabitants are a “terminal species,” and it’s time to end them!
(Well, actually, it’s mainly the werewolves. The fairies and pixies mostly think the native creatures are worth saving. The vampires and leprechauns are undecided.)