If you’ve found your way to the Shazamcast you likely already know something of the confusion created by comics’ two biggest companies, DC and Marvel, both writing books (and marketing more broadly) competing characters bearing the name Captain Marvel.
If this is news to you then it may very well surprise you that the character doesn’t bear the name Marvel because he represents Marvel Comics. No, the first Captain Marvel showed up before there even was a Marvel Comics. And that Captain Marvel is the property of DC. As you can probably guess, there has been no end to the litigation between DC and Marvel over the name “Captain Marvel.”
In another slightly ironic twist, there is a pretty good primer in Les Daniels’ Marvel: Five Fabulous Decades of the World’s Greatest Comics.