The Fantastic Four Vs. The Inferior Five
 I took my super heroes very seriously as a kid so I never checked out The Inferior Five, which looked to me like it was mocking them.  Of course, I can now see that it was a title that was actually ahead of its time, having fun with the conventions of the genre many years before the likes of Damage Control, Ambush Bug, Great lakes Avengers or Sensational She-Hulk hit the stands.
This cover comes about from a suggestion by David Welsh, a Patron of the blog - thanks David!