This one's HairyHeretic's fault! Well, mostly. He's talked me into trying it...
Scions, running amok in the 1920's! Bootleggers! Pirates! Jetpacks and radium powered flashlights! Cthuloid nasties! Dino hunts on lost islands!
Plus, even though we don't have Nazis yet, you get to clobber the Thule Society types. And there's always another Cultist to smack down.
(Oh, right...World at War? Not Gonna Happen Here, and the titans got out a little bit early. Can you say 'Tunguska'?)