One-Shot

Antagonists and villains who only appear in a single episode of any episodic series (cartoons, anime, TV series, etc). This kind of antagonist/villain is a staple on Super Sentai shows, where every episode features a different monster for the heroes to face. They are still considered one shots if any previous/later appearance(s) are background, minor and/or a cameo.

Editing note: Do not put antagonists or villains from books, movies, comics, or video games on here. In addition, if antagonists and villains appear in more than one episode, including movies (or a long movie), they should never be added to this category.