It's pretty much common knowledge that the vast majority of superheroes rely heavily upon their superpowers. Unless you're Batman, there's a pretty good chance that either magic, science or a secret alien bloodline is powering your ability to beatdown whoever stands in your way.
With these powers being so integral to superheroes doing what they do, it's always interesting to see comics where these special abilities are taken away, and our favourite heroes are left trying to figure out what they are when all their cool powers are removed.
This in mind, these comics can vary massively in tone, ranging between profound philosophical debates about superpowers, to hilarious looks into just how inept characters like Superman can be when they're without their superhuman talents.
While they're seldom permanent, seeing how different superheroes react to losing one of the most important things about them will always make for an unforgettable comic, as it provides perhaps the best insight into the actual personality of the character in question - especially on the rare occasion we find out that someone has gotten rid of their powers on purpose.