For any other cinematic franchise, The Eternals would be a massive gamble. It's a mega-budget sci-fi adventure based on a comic book that most people have probably never heard of. It's also being helmed by a director whose only two previous features were critically-acclaimed indies that earned just over $3.5 million at the box office - combined. But none of that is stopping Marvel Studios from pushing full steam ahead with it. And why would it?