7. Captain America - Superpower: Steroids
Remember in the film where the skinny nerd goes into that machine and is injected with weird chemicals and comes out looking like Dwayne Johnson? Well, a similar scene occurs down at many local gyms, but instead of a secret military machine there's a broom cupboard that a guy goes into with lots of needles and then comes out with huge arms and no neck. Captain America is on steroids. That's it! Ask the man himself what his superpower is and he won't be able to answer you. Super strength? No. Super speed? Uh, no. Can you fly? Um, no, I can't. Well, what can you do? I can run a bit faster and I'm stronger and more muscle bound. It sounds like you're on steroids, Captain. No, I'm not - they're secret military chemicals, but I don't know the finer details. Secret military chemicals? You mean steroids, then.