(Crossposted from my own forum...)
If DC hadn't sued Fawcett about Captain Marvel, Otto Binder probably would have stayed THERE rather than go to DC and create Krypto, Supergirl, Brainiac, Bizarro...and the Legion of Super-Heroes.
Since the Fawcett crew tended to tangle with supernatural more than alien menaces, I sort of re-envisioned a Legion of Super-Natural Heroes, with a Warlock Lad, a Ghost Girl, a Boy Werewolf (and other members might be Golem Guy, Banshee Girl, Leprauchaun Lass, etc...)
So I re-imagined the first Legion cover in Adventure--where the Legion tunred a thumbs down on Superboy---to a Master Comics cover starring Captain Marvel Jr. and the aforementioned mebers. You can see it at
http://www.flickr.com/photos/alschroeder/155581243/.
---Al