I knew pretty much all of this, but it’s still a fine analysis of “Captain Marvel” — the origin story(ies), why the original isn’t called that any more, why the one called by that name isn’t the original even in their own comic book company, and why the story is entangled not just with two comic book companies but with others foreign and domestic.
But the story of the Captain Marvels begins decades before Marvel Comics was even calling itself “Marvel Comics,” and it’s much, much wilder than you could ever expect. Among other things, it involves Superman, Spawn creator Todd McFarlane, the UK’s Children and Young Persons (Harmful Publications) Act of 1955, the word “atomik” spelled backwards, and preeminent United States legal scholar, Judge Learned Hand.
And I liked this:
They say that life is stranger than fiction, but I know it to be true; because both Marvel and DC Comics have characters known as “Captain Marvel,” and in 2019, both of those characters have feature films out within a month of each other.
The tangled stories of the Captains Marvel is darned fun. Enjoy: Shazam & Captain Marvel are forever linked. This is the wild story why – Polygon

