As we all know, crime-fighting can be a tough gig. For one thing you have to fight criminals. It's in the name. I'm so passive I won't even ask a stranger for directions.
Not to mention the costumes (oh lord, the costumes). You have the choice of skin-tight spandex that probably provides absolutely no support. Or, you can wear a metric ton of computerized body armor that probably requires constant software updates. Seriously, how many times do you think Tony Stark has to hit the restart on that Iron Man suit?
It's a thankless job. Spider-Man is the pariah of New York City thanks to muckraking J. Jonah Jamison. Wolverine has to deal with constant romantic anguish and frequent bouts of memory loss. Superman has the world on his shoulders most days, and Batman, well… You know what? Batman has it pretty good. The dude's a billionaire, and he can quit the superhero thing at any time.
But with all those hardships, it's no wonder that superheroes need a break sometimes. When they do go on sabbatical - or die, no one bats a thousand, right? - it leaves quite a void in the world. That's why the following is a list of people who secretly replaced our favorite superheroes.