Monster of the Week: Even though the episode featured aliens (apparently), this was the only time when they made an appearance and they were not a part of the mythology.
Ninja Pirate Zombie Robot: There's so much going on with the Monsters of the Week that it gets a bit overwhelming. They're human-looking aliens who have no resemblance to any other aliens in the show, who switch genders after they have sex, and also kill their sex partners. And they're not very good-looking, but their touch can seduce. And there's something going on with the clay they use. Oh, and they're immortal.