The Green Scourge of the Sky Raiders

Published in G-8 #80, 05/01/1940
[This story introduced the American traitor called Herr Grun ("Mr Green"), interchangeably referred to as Grun ("Groon") the Primeval. In this debut adventure the super-villain took to the skies in a Zepellin that carried his team and his invention – a wireless ray that would cause all the ammunition on Allied planes to explode before they could even fire at enemy aircraft.]