Doc Savage, 1943
This radio series was based on the Doc Savage character as portrayed in
the Street and Smith comics starting in August of 1941. In Doc Savage Comics
#5 ("The Angry Ghost" by Jack Binder) Doc crash-lands in Tibet
where a Tibetan mystic finds him and nurses him back to health. The mystic
then bestows Doc with
a magic blue hood, which has a sacred ruby on its
forehead. This cowl endows Doc with super-strength and hypnotic powers (as
if his own weren't enough!). So far, no recordings from this series have
turned up. Most of the scripts do exist, though.
Three were printed in a booklet, The Invincible Doc Savage.