35. Black Knight
First appearance: Avengers #47 (1967)
Contrary to popular opinion, being an Avenger doesn’t automatically promote you to the cream of the superhero crop. Look at the Black Knight, for example; despite being a member of Earth’s Mightiest Heroes for decades, he’s about as vital to the team as the foosball table in the Stark Tower break room.
You'd think that an ancestor of one of King Arthur's most loyal knights would be the embodiment of sword-wielding nobility; unfortunately, he’s nothing more than a stock character that rarely gets any love. Of course, Hollywood power players now see green from anything Avengers-related, but the world can certainly do without Black Knight: An Avengers' Tale.