5. The Key
Who? An absolute donk obsessed with locks, keys, and some of the worst puns ever recorded.
Why We Won't See Him... The second iteration of The Key, dubbed Key-Master of the World, debuted in Justice League of America #41. His evil lair, the Key Hole, is hidden in an abandoned locksmith company building! He sleeps in a padlock-shaped bed, shoots blasts from a key-shaped gun, and generally looks like a garbage man with a giant U on his head. This atrocity would have been long forgotten if Grant Morrison wasnt a masochist determined to reboot abysmal characters for the sake of novelty. Hes basically one of hundreds of awful themed villains that emerged in the Silver Age of comic books, utterly forgettable, and for good reason.