Captain Marvel
Whoops! Turns out there's two superheroes named Captain Marvel. Are you looking for:
Shazam! (right): The original, created in The Golden Age of Comic Books. Billy Batson shouts the magic word "SHAZAM!" to call down magic lightning which transforms him into the World's Mightiest Mortal. Now owned by DC Comics, but couldn't be advertised with his real name for years and eventually had it changed to "Shazam" due to...
Captain Mar-Vell (left): Created by Marvel Comics when the trademark lapsed. A Captain in the alien Kree army named Mar-Vell, sent to spy on Earth but coming to use his powers to protect humans. He eventually died of cancer, but has been succeeded by several other heroes to take the "Captain Marvel" name.
(Apparently, at least one other comics company decided to cash in on the Captain Marvel name, too.)
Please update links to point to the correct Captain Marvel.
- ↑ Well, I wasn't...