Villains will appear in strictly ascending order by menace.
This trope has ancient roots. Possibly the earliest example, at least in the English language, is the Older Than Print epic Beowulf. It just makes good sense that as our heroes fight the forces of evil, they should get better at fighting the forces of evil. So as the story progresses, the fights should get easier and easier. Of course, [...] [tvtropes.org]