Arghh, do you know what today is? Doc sure does as these covers attest!
Doc ran across his fair share of modern day pirates as well as a couple of masquerading as ghosts. More so than most pulp heroes I suppose. And, in Murray's recent book, The Infernal Buddha, Doc gets to impersonate one as well. It's a testament to the versatility of stories that the concept of Doc and his crew can be plugged into. The Shadow and his ilk always seemed a bit out of place when taken away from their urban streets of skyscrapers, high society swells and back-alley thugs. But, Doc's stage was the world, from lost societies to farthest arctic reaches to dense jungles and hidden tribes to the mines and ranches of the American West. Interestingly, the one place he didn't seem to appear to much in was in that staple of pulp fiction, Chinatown. Why settle for Chinatown when could go to the Far East itself?
Have to admit, I have a special fondness for the Bama cover of "The Pirate's Ghost". "Ghost Pirates from Beyond" from Marvel's b/w Doc Savage comic magazine is also one of his best outings in the comic book world.